Page 2
SiUS342004EB Introduction ..................1 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Part 1 General Information ............... 9 1.
Page 3
SiUS342004EB 3.2 BRC1H71W....................66 3.3 When Wireless Remote Controller is Used Together......... 68 4. Address Setting for Wireless Remote Controller........69 5. Centralized Control Group No. Setting............71 5.1 BRC1E73 ....................71 5.2 BRC1H71W....................73 5.3 Wireless Remote Controller ............... 73 5.4 Group No. Setting Example................ 74 6.
Page 4
SiUS342004EB 9. Outline of Control (Indoor Unit) ...............105 9.1 Operation Flowchart ................. 105 9.2 Set Temperature and Control Target Temperature........109 9.3 Remote Controller Thermistor ..............111 9.4 Thermostat Control................... 113 9.5 Drain Pump Control.................. 116 9.6 Control of Electronic Expansion Valve ............. 118 9.7 Freeze-Up Prevention Control..............
Page 5
SiUS342004EB 1.4 Gas Furnace Lockout Reset..............212 1.5 With Infrared Presence/Floor Sensor ............213 2. Error Code via Remote Controller............214 2.1 BRC1E73 ....................214 2.2 BRC1H71W....................215 2.3 Wireless Remote Controller ..............215 3. Troubleshooting by Error Code ...............217 3.1 Error Codes and Descriptions ..............217 3.2 Error Codes (Sub Codes).................
Page 6
SiUS342004EB 3.42 Refrigerant Overcharged................299 3.43 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB)......................300 3.44 Outdoor Fan PCB Abnormality..............301 3.45 Thermistor Abnormality ................302 3.46 High Pressure Sensor Abnormality ............304 3.47 Low Pressure Sensor Abnormality ............305 3.48 Inverter PCB Abnormality.................
Page 7
SiUS342004EB 4.8 Thermistor Check ..................366 4.9 Pressure Sensor Check ................369 4.10 Broken Wire Check of the Relay Wires ............ 370 4.11 Fan Motor Connector Check (Power Supply Cable) ........ 372 4.12 Fan Motor Connector Check (Signal Cable) ..........374 4.13 Electronic Expansion Valve Coil Check ...........
Page 8
SiUS342004EB Introduction 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Introduction...
Page 9
SiUS342004EB Safety Cautions 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
Page 10
Safety Cautions SiUS342004EB Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
Page 11
SiUS342004EB Safety Cautions Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
Page 12
Safety Cautions SiUS342004EB Warning Do not mix air or gas other than the specified refrigerant (R-410A) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
Page 13
SiUS342004EB Safety Cautions Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or greater. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.
Page 14
Icons Used SiUS342004EB 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...
Page 15
SiUS342004EB Revision History 3. Revision History Month / Year Version Revised contents 11 / 2019 SiUS342004E First edition 03 / 2021 SiUS342004EA Model addition: HXY48TAVJU, BRC1H71W Model addition: RXYQ72-384XBYCA, FXFQ07-54AAVJU, FXZQ05-18TBVJU, FXUQ18-36PAVJU, 01 / 2024 SiUS342004EB FXSQ05-54TBVJU, FXMQ15-54TBVJU, FXMQ72/96TAVJU, FXTQ09-60TBVJUA, FXTQ09-60TBVJUD Introduction...
SiUS342004EB Part 1 General Information 1. Model Names ....................10 1.1 Outdoor Unit ....................10 1.2 Indoor Unit....................11 1.3 Air Treatment Equipment ................12 2. External Appearance................. 13 2.1 Outdoor Unit ....................13 2.2 Indoor Unit....................14 2.3 Air Treatment Equipment ................15 3.
SiUS342004EB Model Names 1. Model Names Outdoor Unit Capacity Range (ton) Power supply, Standard Capacity Index 72XA 96XA 120XA 144XA 168XA 192XA 216XA Heat Pump RXYQ 72XB 96XB 120XB 144XB 168XB 192XB 216XB Capacity Range (ton) Power supply, Standard Capacity Index 240XA 264XA 288XA...
SiUS342004EB Model Names Air Treatment Equipment Outdoor-Air Processing Unit Power supply, Series Model name Standard FXMQ 48MF 72MF 96MF VJU* Energy Recovery Ventilator (VAM series) Power supply, Series Model name Standard 300G 470G 600G 1200G VJU* VJ: 1 phase, 208/230 V, 60 Hz U: Standard symbol Part 1 General Information...
External Appearance SiUS342004EB 2. External Appearance Outdoor Unit Single Outdoor Unit 6, 8, 10, 12, 14 ton RXYQ72/96/120/144/168XAYCA RXYQ72/96/120/144/168XBYCA Double Outdoor Unit 16, 18, 20, 22, 24, 26, 28 ton RXYQ192/216/240/264/288/312/336XAYCA RXYQ192/216/240/264/288/312/336XBYCA Triple Outdoor Unit 30, 32 ton RXYQ360/384XAYCA RXYQ360/384XBYCA Part 1 General Information...
SiUS342004EB External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type (Middle and high static pressure) FXFQ-AA FXMQ-PB Shown with BYCQ54EEFU Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type (High static pressure) FXFQ-T FXMQ-TB Shown with BYCQ125B-W1...
External Appearance SiUS342004EB Concealed floor standing type Cased coil unit FXNQ-M CXTQ-TA Air handling unit Low-temperature hydrobox FXTQ-TA HXY-TA FXTQ-TB Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G Part 1 General Information...
SiUS342004EB Combination of Outdoor Units 3. Combination of Outdoor Units System capacity Module Number Outdoor unit multi Model name of units connection piping kit 1 RXYQ72XA RXYQ72XB RXYQ96XA 10.0 RXYQ96XB RXYQ120XA — 12.5 RXYQ120XB RXYQ144XA 15.0 RXYQ144XB RXYQ168XA 17.5 RXYQ168XB RXYQ192XA 20.0 RXYQ192XB...
Capacity Range SiUS342004EB 4. Capacity Range Connection Ratio Total capacity index of the indoor units Connection ratio = Capacity index of the outdoor units Max. combination ratio Type of connected Types of connected indoor units air treatment equipment When using at FXMQ-MF Min.
Refrigerant Circuit (Piping Diagrams) SiUS342004EB 1. Refrigerant Circuit (Piping Diagrams) Outdoor Unit No. in Electric piping Name Function symbol diagram Compressor Compressor is operated in multi-steps according to Te and Tc by using inverter. Fan motor Because the system is an air heat exchange type, the fan rotation speed is varied by using inverter.
Page 41
SiUS342004EB Refrigerant Circuit (Piping Diagrams) No. in Electric piping Name Function symbol diagram Thermistor (Compressor Used to detect suction pipe temperature of compressor. (33) R12T suction) (34) R13T Thermistor (Receiver gas purge) Used to detect gas pipe temperature of receiver gas purge piping. Thermistor (M1C body) Detects compressor surface temperature, this switch is activated at surface (35)
Refrigerant Circuit (Piping Diagrams) SiUS342004EB Indoor Unit Symbol Except No. in FXMQ-PB FXTQ-TA piping Name Function FXTQ-TA FXMQ-PB FXTQ-TB diagram FXTQ-TB CXTQ-TA CXTQ-TA Electronic expansion valve Used for gas superheating degree control while in cooling or subcooling degree control while in heating.
Page 45
SiUS342004EB Refrigerant Circuit (Piping Diagrams) FXUQ-P, FXEQ-P, FXSQ-TA, FXMQ-M, FXAQ-P, FXLQ-M, FXUQ-PA FXNQ-M Gas piping connection port Indoor heat exchanger Liquid piping connection port C: 4D133246 Filter Filter C: 4D034245S FXSQ-TB, FXMQ-TB FXDQ-M Gas piping connection port Liquid piping connection port Filter Filter C: 4D141716...
Page 46
Refrigerant Circuit (Piping Diagrams) SiUS342004EB FXTQ-TA, FXTQ-TB CXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter C: 4D068194 Part 2 Refrigerant Circuit...
SiUS342004EB Refrigerant Circuit (Piping Diagrams) Indoor Low-Temperature Hydrobox HXY48TAVJU* No. in piping Name Symbol Function diagram Pump Circulates water to the local water piping and radiator. It operates at a maximum of 4,800 rpm. Flow switch Detects an abnormality in the water circuit. If the flow rate of water is below a certain value, an error will be issued.
Refrigerant Circuit (Piping Diagrams) SiUS342004EB Outdoor-Air Processing Unit FXMQ48/72/96MFVJU* Gas pipe connection port Heat exchanger Filter Capillary tube Distributor Solenoid valve Liquid pipe connection port Check valve Filter Filter Electronic expansion valve C: 4D018650D No. in piping Electric symbol Name Function diagram Electronic expansion valve...
SiUS342004EB Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D122252 C: 3D122253 Part 2 Refrigerant Circuit...
Refrigerant Flow for Each Operation Mode SiUS342004EB Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D122252 C: 3D122253 Part 2 Refrigerant Circuit...
SiUS342004EB Refrigerant Flow for Each Operation Mode Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D122252 C: 3D122253 Part 2 Refrigerant Circuit...
Refrigerant Flow for Each Operation Mode SiUS342004EB Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Liquid pipe Gas pipe C: 3D122252 C: 3D122253 Part 2 Refrigerant Circuit...
Page 57
SiUS342004EB Part 3 Remote Controller 1. Applicable Models ..................51 2. Names and Functions ................52 2.1 BRC1E73 ....................52 2.2 BRC1H71W....................55 2.3 Wireless Remote Controller ............... 63 3. Main/Sub Setting..................64 3.1 BRC1E73 ....................64 3.2 BRC1H71W....................66 3.3 When Wireless Remote Controller is Used Together......... 68 4.
SiUS342004EB Names and Functions 2. Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
Page 60
Names and Functions SiUS342004EB 4. Up button Used to raise the setpoint. The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 5.
Page 61
SiUS342004EB Names and Functions Service Check Function <Main Menu> Main Menu • Airflow Direction Airflow Direction • Individual Airflow Direction Individual Airflow Direction • Ventilation Ventilation • Schedule Schedule • Off Timer Off Timer • Celsius / Fahrenheit Celsius / Fahrenheit •...
Names and Functions SiUS342004EB BRC1H71W 2.2.1 Button Locations and Descriptions ON/OFF button • Press this button to turn on the system. • Press this button again to turn off the system. b Status indicator (LED) • During operation, the light ring around the display lights up blue/red/green. Lights up blue: Operating, Blinks red: Error is occurring, Lights up/blinks green: Bluetooth connecting c LCD •...
Page 63
SiUS342004EB Names and Functions 2.2.2 Overview of Screens The following is just an example. The items available for setting vary depending on the indoor unit you are using. If there is no button operation for about 10 seconds, the screen returns to the home screen.
Page 64
Names and Functions SiUS342004EB 2.2.3 Setting Screen List Setting list Installer User Administrator menu menu menu Icon Name Description Depends on Operation Mode Operation mode setting current setting Depends on Fan Speed Airflow rate setting current setting Depends on Airflow Direction Airflow direction 1 setting current setting Depends on...
Page 65
SiUS342004EB Names and Functions Setting list User Administrator Installer menu menu menu Icon Name Description Bluetooth Setting Bluetooth setting Backlight Backlight brightness setting Contrast Contrast setting Clock Setting Clock setting Scale reference temperature Standard Temp setting About Administrator information Administrator password Admin Password setting Installer Password...
Page 66
Bluetooth SIG, Inc. and use of such marks by r Settings menu name Daikin industries, LTD. is under license. Other trademarks and trade names are those of their respective owners. s Settings menu icon INFORMATION Depending on the connected model, some items may not be displayed.
Page 67
SiUS342004EB Names and Functions Home screen list There are 4 types of home screen. The home screen type can be changed by the remote controller setting. Text mode Icon mode Auto Cool ˚F Room Text mode (Scale screen) Icon mode (Scale screen) Auto Cool Cool Warm...
Page 68
Names and Functions SiUS342004EB 2.2.5 Information Screen The functions of the connected indoor unit are displayed as icons. How to display the information screen Home screen Press and hold on the Home screen for 5 Auto Cool ˚F seconds. Room Text mode Icon mode Information screen...
Page 69
* The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and use of such marks by Daikin industries, LTD. is under license. Other trademarks and trade names are those of their respective owners.
Names and Functions SiUS342004EB Wireless Remote Controller ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE SWING TEST TEST DISPLAY (SIGNAL TRANSMISSION) FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or This lights up when a signal is being transmitted.
SiUS342004EB Main/Sub Setting 3. Main/Sub Setting BRC1E73 Situation The Main/Sub setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to Main and the other to Sub.
Page 72
Main/Sub Setting SiUS342004EB 3.1.2 When an Error Occurred U5: there are 2 main remote controllers when power is turned ON Change the setting from Main to Sub on the remote controller you want to be Sub. U8: there are 2 sub remote controllers when power is turned ON Change the setting from Sub to Main on the remote controller you want to be Main.
SiUS342004EB Main/Sub Setting BRC1H71W 3.2.1 Main and Sub Controller a Outdoor unit b Indoor unit c Main remote controller d Sub remote controller • On the information screen, main/sub status is indicated by the following icons: Icon Description Main INFORMATION It is only possible to use a main and a sub controller of the same type.
Page 74
Main/Sub Setting SiUS342004EB 3.2.2 Designating a Controller as Main or Sub Prerequisite: A remote controller is already connected to the indoor unit. Connect a second controller. After turning on the power, perform setting of the second controller. Result: It will start up automatically. Home screen Wait for a U5 or U8 error code to appear on the screen.
SiUS342004EB Main/Sub Setting When Wireless Remote Controller is Used Together When using both a wired and a wireless remote controller for 1 indoor unit, the wired controller should be set to Main. Therefore, the Main/Sub switch (SS1) of the signal receiver PCB must be set to Sub.
Address Setting for Wireless Remote Controller SiUS342004EB 4. Address Setting for Wireless Remote Controller If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller. (This includes an individual remote controller control using the group operation.) (For the wiring for the group operation, please refer to the installation manual attached to the indoor unit.) Setting for signal receiver PCB...
Page 77
SiUS342004EB Address Setting for Wireless Remote Controller 5. Press INSPECTION/TEST button for 1 second to return to normal mode. UP button DOWN button Field setting mode FAN button RESERVE button Address Multiple setting FILTER SIGN RESET button INSPECTION/TEST button Multiple Settings A/b The command such as operation mode or temperature setting by this remote controller will be rejected when the target indoor unit operation is restricted as by an external control such as centralized control.
Centralized Control Group No. Setting SiUS342004EB 5. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller.
Page 79
SiUS342004EB Centralized Control Group No. Setting Note(s) For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual. NOTICE Enter the group No. and installation place of the indoor unit into the installation table. Be sure to keep the installation table with the operation manual for maintenance.
Centralized Control Group No. Setting SiUS342004EB BRC1H71W Group Address • Assign the group address and unit number for centralized control. • The group and unit address can only be set when a centralized controller is connected. This menu is only visible when a centralized controller is connected. •...
SiUS342004EB Centralized Control Group No. Setting 5. Press INSPECTION/TEST button and return to the normal mode. UP button Mode No. Field setting mode DOWN button RESERVE button MODE button Group No. INSPECTION/TEST button Group No. Setting Example Central Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2...
Service Settings Menu, Maintenance Menu SiUS342004EB 6. Service Settings Menu, Maintenance Menu BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press and hold the Press the Cancel Cancel button button once.
Page 83
SiUS342004EB Service Settings Menu, Maintenance Menu 6.1.1 Service Settings Menu Service settings menu Item 2 Remarks Test Operation — — Maintenance Contact None — Maintenance Contact —, 0 to 9 (in order) Field Settings Indoor Unit No. — Mode No. —...
Page 84
Service Settings Menu, Maintenance Menu SiUS342004EB 6.1.2 Maintenance Menu Maintenance Menu Item 2 Remarks Model Name Unit No. Select the unit number you want to check. Indoor unit The model names are displayed. (A model code may be displayed instead, depending Outdoor unit on the particular model.) Operation Hours...
Page 85
SiUS342004EB Service Settings Menu, Maintenance Menu Maintenance Menu Item 2 Remarks Forced Defrost Forced defrost ON Enables the forced defrost operation. Forced defrost OFF Disables the forced defrost operation. Error Display Display error ON Displays the error on the screen. Display error OFF Displays neither errors nor warnings.
Administrator Menu, Installer Menu SiUS342004EB 7. Administrator Menu, Installer Menu BRC1H71W Refer to page 57 for details. Part 3 Remote Controller...
Page 87
SiUS342004EB Part 4 Functions and Control 1. Operation Flowchart (Outdoor Unit) ............82 2. Stop Control ....................83 2.1 Stop due to Error ..................83 2.2 When System is in Stop Control..............83 2.3 Slave Unit Stops during Master Unit Control..........83 3.
Page 88
SiUS342004EB 9.5 Drain Pump Control.................. 116 9.6 Control of Electronic Expansion Valve ............. 118 9.7 Freeze-Up Prevention Control..............119 9.8 List of Swing Flap Operations ..............121 9.9 Hot Start Control (In Heating Operation Only).......... 122 9.10 Louver Control for Preventing Ceiling Dirt..........123 9.11 Heater Control (Except FXTQ-TA, FXTQ-TB Models) ......
SiUS342004EB Operation Flowchart (Outdoor Unit) 1. Operation Flowchart (Outdoor Unit) For detailed description of each function in the flow below, refer to the details on related function on the following pages. Stop control (1) Stop due to error (2) When system is in stop control (3) Slave unit stops during master unit control Special control Standby control...
Stop Control SiUS342004EB 2. Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will stop with thermostat OFF and the error will be determined when the retry times reaches certain number. (Refer to Error Codes and Descriptions on page 217 of the troubleshooting for the items to determine the error.) When System is in Stop Control...
SiUS342004EB Standby Control 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 2 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor fan carry out the residual operation for a while to accelerate pressure equalizing and to suppress migration of the refrigerant to the evaporator.
Startup Control SiUS342004EB 4. Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way valve is also determined.
SiUS342004EB Startup Control Startup Control in Heating Frequency step up +10 rps/10 sec. 5 sec. interval Frequency RXYQ72-120XA RXYQ144/168XA (rps) RXYQ72-120XB RXYQ144/168XB 16.4 16.4 Compressor 0 Hz (M1C) PI control Initial opening Electronic expansion 0 pulse valve (main) (Y1E) Step 8 Fan motor Step 4 (M1F + M2F)
Basic Control SiUS342004EB 5. Basic Control Normal Control Function Part name Electric symbol Normal cooling Normal heating Compressor PI control, High pressure protection, PI control, High pressure protection, Low pressure protection, Low pressure protection, Td protection, Inverter protection Td protection, Inverter protection Fan motor M1F, M2F Cooling fan control...
SiUS342004EB Basic Control Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. On multi-outdoor-unit systems, this control is made according to values of the first-priority unit, which is detected with the pressure sensor.
Basic Control SiUS342004EB Operating Priority and Rotation of Compressors Each compressor operates in the following order of priority. In the case of multi-outdoor-unit system, each compressor operates in Pattern 1 to Pattern 3 according to the outdoor unit rotation. M1C: Compressor Pattern 1 Pattern 2 Pattern 3...
SiUS342004EB Basic Control Compressor Step Control The compressor operation varies in the following steps according to information in Compressor PI Control on page 88. Furthermore, the operating priority of compressors is subject to information in Operating Priority and Rotation of Compressors on page 89.
SiUS342004EB Basic Control Electronic Expansion Valve PI Control Main electronic expansion valve EVM control When the outdoor unit heat exchanging is performed via the condenser (Y5S or Y6S is set to OFF), this function is used to exert PI control on the electronic expansion valve (Y1E or Y3E) so that the condenser outlet subcooling degree (SC) will become constant.
Basic Control SiUS342004EB Step Control of Outdoor Fans Used to control the revolutions of outdoor fans in the steps listed in table below, according to condition changes. Standard (default) Step X Cooling Heating Step No. Cooling Heating RXYQ72XA RXYQ72XB RXYQ96XA RXYQ96XB RXYQ120XA RXYQ120XB...
SiUS342004EB Protection Control 6. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
Page 102
Protection Control SiUS342004EB Heating Normal control < 3.17 MPa > 3.31 MPa (460 psi) (480 psi) Pc: High pressure sensor detection value for master > 3.39 MPa unit (492 psi) All units Compressor step: 1 9-step down After 10 After 10 seconds >...
SiUS342004EB Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Normal control < 0.25 MPa > 0.39 MPa (36.3 psi) (56.6 psi) Pe: Low pressure sensor detection value for master unit All compressors step: 1...
Protection Control SiUS342004EB Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. HTdi : Value of compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature : Compressor body temperature : Maximum of HTdi and Ti X (°C)(Y (°F)) : RXYQ72-120XA, RXYQ72-120XB...
SiUS342004EB Protection Control Compressor Body Protection Control This compressor body protection control is used to protect the compressor internal temperature against an error or transient increase of compressor body temperature. Control The following control is performed for each compressor. Normal control Compressor body temperature >...
Page 106
Protection Control SiUS342004EB Radiation Fin Perform the following control of integrated as well as multi units for each compressor. Temperature Normal control Control Reduce compressor capacity When occurring 4 times within 60 Fin temperature standby minutes, the error code L4 is output. Condition All outdoor units more than 90°C (194°F)
SiUS342004EB Special Control 7. Special Control Pump Down Residual Operation If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Page 108
Special Control SiUS342004EB 7.2.1 Oil Return Operation in Cooling Oil return operation is not conducted before 2 hours have elapsed from the activation of power supply. After 2 hours have elapsed, oil return operation starts when the following item meets the reference value.
SiUS342004EB Special Control Defrost Operation To defrost the outdoor heat exchanger while in Evaporator, the defrost operation is conducted to recover the heating capacity. Tb: Heat exchanger deicer temperature Part name Electric symbol Defrost operation Compressor RXYQ72-120XA, RXYQ72-120XB: 134 rps RXYQ144/168XA, RXYQ144/168XB: 119 rps Fan motor With high pressure...
Special Control SiUS342004EB Outdoor Unit Rotation In the case of multi outdoor unit system, this outdoor unit rotation prevents the compressor from breaking down due to unbalanced oil level between outdoor units. Details of outdoor unit rotation In the case of multi outdoor unit system, each outdoor unit is given an operating priority for the control.
SiUS342004EB Other Control 8. Other Control Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. Emergency operation with remote controller reset and emergency operation with outdoor unit PCB setting are available.
Outline of Control (Indoor Unit) SiUS342004EB 9. Outline of Control (Indoor Unit) Regarding the outline of control for low-temperature hydrobox (HXY-TA), refer to the service manual SiUS392016EA. Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF power supply 4 heater Humidifier...
Page 113
SiUS342004EB Outline of Control (Indoor Unit) ∗10 Program dry operation Fan Operation Program ∗8 Drain dry display : OFF pump kit (Option) ∗9 Aux. ∗4 : OFF electric heater Thermostat status (Option) Humidifier : OFF : Operating in L mode after it stops for 6 min. Operating in L mode Electronic YE :...
Page 114
Outline of Control (Indoor Unit) SiUS342004EB Heating Operation Drain : OFF pump kit Swing flap? 13 13 Set wind direction Swing flap Is test run in progress? 18 defrost conditions for gas operation in furnace operation progress? Depends on the intensity established? of gas combustion.
Page 115
SiUS342004EB Outline of Control (Indoor Unit) min. or less than –1°C (30.2°F) for a cumulative period of 40 min., freeze-up prevention operation will be conducted. If the evaporator inlet temperature is kept at more than 7°C (44.6°F) for a consecutive period of 10 min., the freeze-up prevention operation will be reset. 6.
Outline of Control (Indoor Unit) SiUS342004EB Set Temperature and Control Target Temperature 9.2.1 Without Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. When the suction air thermistor is used for controlling (Default), the control target temperature is determined as follows to prevent insufficient heating in heating operation.
Page 117
SiUS342004EB Outline of Control (Indoor Unit) 9.2.2 With Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. The temperature difference for cooling heating mode switching is 5°C (9°F). When using the floor temperature as the control target, the remote controller set temperature is equal to the actual control target temperature in heating operation.
Outline of Control (Indoor Unit) SiUS342004EB Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note(s) When fresh air intake kit is used, outdoor air is mixed with indoor air, and the room temperature...
Page 119
SiUS342004EB Outline of Control (Indoor Unit) Assuming suction temperature has changed from 30°C (86°F) to 18°C (64°F) (F A): Suction air thermistor is used for temperatures from 30C (86F) to 25C (77F) (F D). Remote controller thermistor is used for temperatures from 25C (77F) to 21C (70F) (D B). Suction air thermistor is used for temperatures from 21C (70F) to 18C (64F) (B...
Outline of Control (Indoor Unit) SiUS342004EB Thermostat Control The thermostat ON/OFF differential value (factory setting) differs depending on the models. Differential value Model 1°C (1.8°F) FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ-TA, FXHQ-M, FXTQ-TA, FXTQ-TB FXFQ-AA, FXZQ-TB, FXUQ-PA, FXDQ-M, FXSQ-TB, FXMQ-PB, FXMQ-TB, 0.5°C (0.9°F) FXMQ-TA, FXMQ-M, FXAQ-P, FXLQ-M, FXNQ-M, FXMQ-MF, CXTQ-TA 9.4.1 Without Infrared Floor Sensor...
Page 121
SiUS342004EB Outline of Control (Indoor Unit) 9.4.2 With Infrared Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the detected temperature around people. Normal operation Cooling operation ΔT ≤...
Page 122
Outline of Control (Indoor Unit) SiUS342004EB 9.4.3 Thermostat Control with Operation Mode Set to AUTO The system will conduct this temperature control shown below, only when the wireless remote controller or any central remote controller is connected. Furthermore, setting changes of the differential value (D) can be made. : Factory setting Second code No.
SiUS342004EB Outline of Control (Indoor Unit) Drain Pump Control 9.5.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. The float switch is ON in normal operation. When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. ...
Page 124
Outline of Control (Indoor Unit) SiUS342004EB 9.5.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. When the float switch turns OFF, the drain pump turns ON simultaneously. ...
SiUS342004EB Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheating degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command.
Outline of Control (Indoor Unit) SiUS342004EB Freeze-Up Prevention Control Freeze-Up Prevention by Off Cycle (Indoor Unit) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
Page 127
SiUS342004EB Outline of Control (Indoor Unit) Note(s) When the indoor unit is FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, or FXUQ-PA, if the air outlet is set as dual-directional or tri-directional, the starting conditions will be changed as follows. Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes) Liquid pipe temperature ≤...
Outline of Control (Indoor Unit) SiUS342004EB List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXZQ-TA FXZQ-TB FXFQ-AA FXEQ-P FXHQ-M FXUQ-P FXFQ-T FXUQ-PA FXAQ-P Hot start from defrost Swing Horizontal Horizontal Horizontal Horizontal operation Airflow direction set Horizontal Horizontal Horizontal...
SiUS342004EB Outline of Control (Indoor Unit) Hot Start Control (In Heating Operation Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2: Temperature detected with the gas thermistor Tc: High pressure equivalent saturated temperature Starting condition...
Outline of Control (Indoor Unit) SiUS342004EB 9.10 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.
SiUS342004EB Outline of Control (Indoor Unit) 9.11 Heater Control (Except FXTQ-TA, FXTQ-TB Models) Note(s) Optional PCB KRP1B... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/OFF) is conducted as shown below. Set temperature 2˚C 2˚C...
Outline of Control (Indoor Unit) SiUS342004EB 9.12 Heater Control (FXTQ-TA, FXTQ-TB Models) Note(s) Optional heater kit HKS... is required. For FXTQ-TA and FXTQ-TB models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS…(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.).
Page 133
SiUS342004EB Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
Page 134
Outline of Control (Indoor Unit) SiUS342004EB 9.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.
SiUS342004EB Outline of Control (Indoor Unit) 9.13 Gas Furnace Control (CXTQ-TA Models) Outline When conditions for gas furnace operation are established, the system transits into gas furnace operation, CXTQ-TA requires the gas furnace combustion heating. Detail • Thermostat: ON • Thermostat: OFF Thermostat OFF Thermostat ON •...
Outline of Control (Indoor Unit) SiUS342004EB 9.14 3-Step Thermostat Processing (FXTQ-TA, FXTQ-TB Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with Thermostat step 1. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA, FXTQ-TB Models) on page 125.
SiUS342004EB Outline of Control (Indoor Unit) 9.15 Fan Control (Heater Residual) (FXTQ-TA, FXTQ-TB Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
Page 138
Outline of Control (Indoor Unit) SiUS342004EB 9.16.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
Page 139
SiUS342004EB Part 5 Field Settings and Test Operation 1. Field Settings for Indoor Unit..............133 1.1 Field Settings with Remote Controller ............133 1.2 List of Field Settings for Indoor Unit ............140 1.3 Detailed Explanation of Setting Modes ............ 146 1.4 Field Settings of Low-Temperature Hydrobox..........
Field Settings for Indoor Unit SiUS342004EB 1. Field Settings for Indoor Unit Field Settings with Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the field setting in accordance with the following description.
Page 141
SiUS342004EB Field Settings for Indoor Unit Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repea t (3) to (7). After all setting changes are Press Menu/OK button.
Page 142
Field Settings for Indoor Unit SiUS342004EB 1.1.2 BRC1H71W Enter the Installer Menu and make settings. Installer menu screen Press button, for move to “ ”. Field Setting If Bluetooth is connected, performing field setting from the remote controller side is impossible.
Page 143
SiUS342004EB Field Settings for Indoor Unit Sub-menu screen Press button, scroll to the desired Unit Mode 20 Mode 20 No. and then press button to set the Unit 00 Unit 00 selection. Enter Return Text mode Icon mode Sub-menu screen Press button, to select “Enter”...
Page 144
Field Settings for Indoor Unit SiUS342004EB Sub-menu screen Press button, to scroll to the desired SW 00 SW 00 Second Code No., and then press button. – 01 – 01 Cancel Text mode Icon mode Sub-menu screen Press button, select “Set” or “ ”, and SW 00 SW 00...
Page 145
SiUS342004EB Field Settings for Indoor Unit 1.1.3 Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: ...
Page 146
Field Settings for Indoor Unit SiUS342004EB 1.1.4 Simplified Remote Controller Mode No. First code Unit No. Second code No. (2)(8) (7) 1. Remove the upper part of remote controller. 2. When in the normal mode, press the BS6 button (2) (field setting) to enter the field setting mode.
SiUS342004EB Field Settings for Indoor Unit List of Field Settings for Indoor Unit : Factory setting First Second Code No. Mode Reference Code Setting Contents Page (Note 2) Approx. Filter Ultra long life Approx. cleaning filter 10,000 5,000 hrs. sign hrs....
Page 148
Field Settings for Indoor Unit SiUS342004EB First Second Code No. Mode Reference Code Setting Contents Page (Note 2) Ceiling height setting, Setting Standard High ceiling 1 High ceiling 2 — of normal airflow Airflow direction setting 4-direction 2-direction 3-direction airflow —...
Page 149
SiUS342004EB Field Settings for Indoor Unit 1.2.1 Applicable Range of Field setting First Field Code Setting Modes setting Filter cleaning sign interval Filter sign setting — — — — — — — — — Filter type — — — Filter cleaning sign interval —...
Page 150
Field Settings for Indoor Unit SiUS342004EB First Field Code Setting Modes setting Ceiling height setting, Setting — — — — of normal airflow Airflow direction setting — — — — — Swing pattern settings — — — — — Airflow direction adjustment 13 (23) —...
Page 151
SiUS342004EB Field Settings for Indoor Unit First Field Code Setting Modes setting Filter cleaning sign interval — — Filter sign setting — — — — — — Filter type — — — — — — Filter cleaning sign interval — —...
Page 152
Field Settings for Indoor Unit SiUS342004EB First Field Code Setting Modes setting Optional kit setting (UV lamp — — — — — — + Humidifier + Economizer) Dry mode set temperature — — — — — — 14 (24) Mold proof operation setting —...
SiUS342004EB Field Settings for Indoor Unit Detailed Explanation of Setting Modes 1.3.1 Filter Cleaning Sign Interval, Filter Type : Factory setting 10 (20)-1 01: Long life filter 02: Ultra long life filter Setting Filter contamination heavy/light Light Heavy Light Heavy 01...
Page 154
Field Settings for Indoor Unit SiUS342004EB FXTQ-TA, FXTQ-TB, CXTQ-TA : Factory setting Mode No. First Code No. Second Code No. Contents — 10 (20) Remote sensor thermistor only 03 Remote controller thermistor only When the Second Code No. is set to 02, room temperature is controlled by the remote sensor thermistor.
Page 155
SiUS342004EB Field Settings for Indoor Unit Note(s) The control is automatically switched to the one performed only by the suction air thermistor for indoor unit when the Second code No. is 01 during group control. To use the remote controller thermistor control during group control, select the Second code No.
Page 156
Field Settings for Indoor Unit SiUS342004EB Detection State of absence (°F) (°C) 87.8 84.2 82.4 80.6 Cooling (at 28°C (82.4°F)) 78.8 69.8 Heating (at 20°C (68°F)) 66.2 64.4 62.2 30 (60) 60 (120) Elapsed time of absence (min.) The values in parentheses represent the time when Second code No.
Page 157
SiUS342004EB Field Settings for Indoor Unit There is a limitation of combination between Ton and Toff as below due to 2°C (3.6°F) hysteresis required for reliability. Second Code No. –4°C –3.5°C –3°C –2.5°C –2°C –1.5°C (–7.2°F) (–6.3°F) (–5.4°F) (–4.5°F) (–3.6°F) (–2.7°F) 0.5°C (0.9°F) 0°C (0°F)
Page 158
Field Settings for Indoor Unit SiUS342004EB 1.3.8 Electric Heater Setting (for FXTQ-TA, FXTQ-TB models) : Factory setting Contents Second Code Mode No. First Code No. Electric heater run for Heater operation defrost/oil return operation Electric heater with heat 01 Not allowed pump not allowed...
Page 159
SiUS342004EB Field Settings for Indoor Unit 1.3.10 Detection Rate Setting (For units with an infrared presence sensor only) Set the sensitivity of the infrared presence sensor. The infrared presence sensor can be disabled by selecting the Second code No. 04. Note(s) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in...
Page 160
Field Settings for Indoor Unit SiUS342004EB 1.3.12 Compensating the Temperature around People (For units with the infrared floor sensor only) Change the ratio between the suction air temperature and floor temperature used to calculate the temperature around human. The temperature around human is calculated using the values of the suction air thermistor and the infrared floor sensor.
Page 161
SiUS342004EB Field Settings for Indoor Unit 1.3.15 Optional Accessories Output Selection Using this setting, operation output signal and abnormal output signal can be provided. Output signal is output between terminals X1 and X2 of adaptor for wiring, an optional accessory. : Factory setting Mode First Code...
Page 162
Field Settings for Indoor Unit SiUS342004EB 1.3.18 Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. If the airflow setting when thermostat is OFF is set to 03: OFF, the air in the indoor unit will be stagnant and suction air thermistor may not detect room temperature correctly, resulting in problems that thermostat will not be ON easily.
Page 163
SiUS342004EB Field Settings for Indoor Unit 1.3.21 Airflow Setting when Cooling Thermostat is OFF This is used to set airflow to LL airflow when cooling thermostat is OFF. If the airflow setting when thermostat is OFF is set to 03: OFF, the air in the indoor unit will be stagnant and suction air thermistor may not detect room temperature correctly, resulting in problems that thermostat will not be ON easily.
Page 164
Field Settings for Indoor Unit SiUS342004EB FXZQ-TA, FXZQ-TB, FXEQ-P : Factory setting Mode First Code Second Contents Ceiling height Code No. 01 Standard Lower than 2.7 m (8-3/4 ft) 13 (23) High Ceiling 1 Lower than 3.0 m (10 ft) Higher Ceiling 2 Lower than 3.5 m (11-1/2 ft) FXUQ-P, FXUQ-PA...
Page 165
SiUS342004EB Field Settings for Indoor Unit 1.3.24 Swing Pattern Settings (For units with the infrared floor sensor only) Set the flap operation in swing mode. With the factory swing, flaps facing each other are synchronized to operate, and flaps placed side by side are set to swing in an opposite direction to agitate airflow to reduce temperature irregularity.
Page 166
Field Settings for Indoor Unit SiUS342004EB 1.3.27 External Static Pressure Settings Make external static pressure setting automatically using automatic airflow adjustment (11 (21)-7), or manually using external static pressure settings (13 (23)-6). FXSQ-TA, FXSQ-TB models : Factory setting Mode No. First Code No.
Page 167
SiUS342004EB Field Settings for Indoor Unit FXMQ-TB models : Factory setting Mode No. First Code No. Second Code No. Contents 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 90 Pa (0.36 inWG) 07...
Page 168
Field Settings for Indoor Unit SiUS342004EB 1.3.28 Optional Kit Setting (UV lamp + Humidifier + Economizer) (for FXTQ-TA, FXTQ-TB, CXTQ-TA models) : Factory setting Contents Second Code Economizer setting for Mode No. First Code No. UV lamp + humidifier fan Mech standby duration speed (minutes)
Page 169
SiUS342004EB Field Settings for Indoor Unit 1.3.32 Drain Pump Operation Setting The drain pump operation can be disabled for natural drainage by changing the following field setting. : Factory setting FXMQ-PB Mode First Code Second Code Contents — 15 (25) 02...
Page 170
Field Settings for Indoor Unit SiUS342004EB 1.3.36 Individual Ventilation Setting This is set to perform individual operation of Energy recovery ventilator using the remote controller/central unit when Energy recovery ventilator is built in. (Switch only when Energy recovery ventilator is built in.) : Factory setting Mode First Code...
Page 171
SiUS342004EB Field Settings for Indoor Unit 1.3.40 Access Permission Level Setting For BRC1E73 only There are 2 levels as follows: Level 2: The following buttons are selectable to be disable or enable. Level 3: No buttons are selectable and only On/Off button is available. Button Level 2 Level 3...
Field Settings for Indoor Unit SiUS342004EB Field Settings of Low-Temperature Hydrobox Regarding the field settings of the low-temperature hydrobox (HXY-TA), refer to the service manual SiUS392016EA. Gas Furnace Set Up Set-up for gas furnace is possible only by using the DIP switches located on CXTQ-TA. Gas furnace’s DIP switch is not valid.
SiUS342004EB Field Settings for Indoor Unit Dip switch — — B — — ON OFF Heating Speed Tap — — — — List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Code Setting Contents Filter contamination 2500 hr 1250 hr...
Page 174
Field Settings for Indoor Unit SiUS342004EB How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below.
SiUS342004EB Field Settings for Outdoor Unit 2. Field Settings for Outdoor Unit To continue the configuration of the VRV heat pump system, it is required to give some input to the logic board of the unit. This chapter will describe how manual input is possible by operating the BS buttons/DIP switches on the logic board and reading the feedback from the 7 segment displays.
Page 176
Field Settings for Outdoor Unit SiUS342004EB (1) Microcomputer normal monitor This monitor blinks while in normal control, and turns ON or OFF when an error occurs. (2) Segment display Used to check the transmission and display the transmission state between indoor and outdoor units, the contents of error, and the contents of field setting.
SiUS342004EB Field Settings for Outdoor Unit Accessing the BS Buttons on the PCB It is not required to open the complete control box to access the BS buttons on the PCB and read out the seven-segment display(s). To access you can remove the service window cover (see figure). Now you can open the inspection door of the control box cover (see figure).
Field Settings for Outdoor Unit SiUS342004EB Operating the BS Buttons and DIP Switches on the PCB Operating the BS By operating the BS buttons it is possible to: buttons Perform special actions (test operation, etc.). Perform field settings (demand operation, low noise, etc.). Below procedure explains how to operate the BS buttons to reach the required mode in the menu, select the correct setting and modify the value of the setting.
Page 179
SiUS342004EB Field Settings for Outdoor Unit Accessing modes The MODE (BS1) button is used to change the mode you want to access. Access mode 1 Press the MODE (BS1) button once. Segment indication changes to: Access mode 2 Press the MODE (BS1) button for at least 5 seconds.
Page 180
Field Settings for Outdoor Unit SiUS342004EB Mode 2 Mode 2 is used to set field settings of the outdoor unit and system. Changing and access the setting in mode 2: Once mode 2 is selected (press the MODE (BS1) button for more than 5 seconds), you can select the wanted setting.
SiUS342004EB Field Settings for Outdoor Unit Connecting the PC Configurator to the Outdoor Unit Connection of the optional PC configurator cable to the outdoor unit has to be done on A1P. Connect the 999482P3 cable to the 5-pin blue connector X27A. Caution Works executed on the outdoor unit are best done under dry weather conditions to avoid water ingress.
Field Settings for Outdoor Unit SiUS342004EB Monitoring Function and Field Settings The operation of the outdoor unit can further be defined by changing some field settings. Next to making field settings it is also possible to confirm the current operation parameters of the unit. The setting can also be performed via the PC configuration software.
Page 183
SiUS342004EB Field Settings for Outdoor Unit [1-10]: shows the total number of connected indoor units. It can be convenient to check if the total number of indoor units which are installed match the total number of indoor units which are recognized by the system. In case there is a mismatch, it is advised to check the communication wiring path between outdoor and indoor units (F1/F2 communication line).
Page 184
Field Settings for Outdoor Unit SiUS342004EB 2.5.2 Overview of Setting Mode (Mode 2) This overview shows the available settings by using the press buttons on the outdoor unit PCB. 7 segment 7 segment display display Item Description Description Range 1 COOL/HEAT Several systems as 1 zone change Individual...
Page 185
SiUS342004EB Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range 1 Power transistor Used to troubleshoot DC check compressor. Inverter waveforms ON (10 Hz) are output without wire connections to the compressor. It is useful to determine whether the relevant trouble has resulted from the compressor or inverter PCB.
Page 186
Field Settings for Outdoor Unit SiUS342004EB 7 segment 7 segment display display Item Description Description Range 1 Outdoor > 40 m To increase Tc target heating. Level > 40 m (130 ft) Level max. 40 m (130 ft) (130 ft) below indoor Do not use Heat pump...
Page 187
SiUS342004EB Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range 1 Heat pump Heat pump would be resumed 2.8°C (5°F) 5.6°C (10°F) lockout release when the outdoor air temperature differential is recovered by differential above 8.3°C (15°F) the heat pump lockout temperature.
Page 188
Field Settings for Outdoor Unit SiUS342004EB 2.5.3 Details of Setting Mode 2 Mode 2 is used to change the field settings of the system. Consulting the current field setting value and changing the current field setting value is possible. In general, normal operation can be resumed without special intervention after changing field settings.
Page 189
SiUS342004EB Field Settings for Outdoor Unit Default value: 0 Field setting: 1-31. The source for cool/heat selection can be: • Indoor unit: when outdoor unit DIP switch DS1-1 is at the OFF position. • Cool/heat switch: set DIP switch DS1-1 on outdoor unit PCB to ON. Operation mode according to connections A-B-C to optional PCB BRP2A81.
Page 190
Field Settings for Outdoor Unit SiUS342004EB Change [2-9] to 0, 1, 3 or 6 in function of required operation method during heating. For more information and advice about the effect of these settings, refer to Energy Saving and Optimum Operation on page 201. [2-12]: Enable the night-time low noise function and/or power consumption limitation via external control adaptor (DTA104A61/62)
Page 191
SiUS342004EB Field Settings for Outdoor Unit [2-22]: Automatic night-time low noise setting and level during night-time By changing this setting, you can activate the automatic night-time low noise operation function of the unit and define the level of operation. Depending on the chosen level, the noise level will be lowered (3: Level 3 <...
Page 192
Field Settings for Outdoor Unit SiUS342004EB [2-28]: Power transistor check mode To evaluate the output of the power transistors. Use this function in case error code is displayed related to defective inverter PCB or compressor is locked. Default value: 0. Power transistor check mode is not active. Field setting 1: Power transistor check mode is active.
Page 193
SiUS342004EB Field Settings for Outdoor Unit Next time graph shows the different steps during the power transistor check mode. Switching sequence during power transistor check mode: Power transistor check mode disconnect fastened U/V/W from compressor! Voltage Step 1: Step 2: Check 4 Magnet output...
Page 194
Field Settings for Outdoor Unit SiUS342004EB If capacity priority is set in Operation "Capacity priority setting", the fan sound speed will be increased Time set with "Night-time low according to the load of air Time set with "Night-time low noise operation end setting" conditioning when load is heavier.
Page 195
SiUS342004EB Field Settings for Outdoor Unit [2-32]: Forced, all time, power consumption limitation operation (no external control adaptor is required to perform power consumption limitation) If the system always needs to run under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
Page 196
Field Settings for Outdoor Unit SiUS342004EB [2-38]: Emergency operation “Master” To disable permanent compressor operation: in case of single module or “Master” unit of a multi outdoor system, this setting allows: Default value: 0. Compressor operation enabled. Field setting: Set 3: master module is disabled permanently. [2-39]: Emergency operation “Slave 1”...
Page 197
[2-64] 0 (default) Single module to dual module installation Dual module to triple module installation Conditions/rules apply for this setting. Refer to selection software or contact your Daikin sales representative for further details. [2-81]: Cooling comfort setting for VRT control...
Page 198
Field Settings for Outdoor Unit SiUS342004EB [2-82]: Heating comfort setting for VRT control Default value: 1. Value Heating comfort setting [2-82] 1 (default) Mild Quick Powerful Change [2-82] to 0, 1, 2 or 3 in function of required limitation. This setting is used in conjunction with setting [2-9]. When [2-82] is set to 0, the original refrigerant temperature target based on [2-9] is kept without any correction, unless for protection control.
Page 199
SiUS342004EB Field Settings for Outdoor Unit [2-92]: Te target temperature upper limit Default value: 1. Value Te target temperature upper limit [2-92] 1 (default) If Auto Te, then use this setting to address different load profiles. If the frequent operation is at lower system load, then use a higher setting under [2-92].
Page 200
Field Settings for Outdoor Unit SiUS342004EB 2.5.4 Auxiliary Heat Control To improve efficiency the auxiliary heat can be lockout based on outdoor temperature. Item Description Increments Auxiliary heater Below this temperature, auxiliary 65°F (18.3°C) 0°F 5°F allowable heater can be energized based on (Default (−17.7°C) (2.8°C)
Page 201
SiUS342004EB Field Settings for Outdoor Unit 2.5.5 Heat Pump Lockout New control logic to provide more application options for cold climates. Outside temperature can now be measured directly from the outdoor unit coil sensor. This field setting can switch automatically to emergency heat if there is a system fault. Item Description Increments...
Page 202
Field Settings for Outdoor Unit SiUS342004EB [2-78]: Heat pump lockout temperature Heat pump would be locked out when the outdoor air temperature is smaller than the Heat Pump Lockout Temperature below – this setting is only affective when heat pump lockout mode has been set. Unit will switch to heat pump lockout. Heat pump lockout Fahrenheit (°F) Celsius (°C)
Page 203
SiUS342004EB Field Settings for Outdoor Unit Error code Error contents (Auto backup possible) Activation of high pressure switch Activation of low pressure sensor Compressor motor lock Compressor damage alarm Outdoor fan motor abnormality Electronic expansion valve coil abnormality Position signal abnormality of outdoor fan motor Outdoor air thermistor (R1T) abnormality Discharge pipe temperature abnormality Wet alarm...
Field Settings for Outdoor Unit SiUS342004EB Night-Time Low Noise Operation and Demand Operation 2.6.1 Night-Time Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Setting Content Level 1...
Page 205
SiUS342004EB Field Settings for Outdoor Unit Image of operation in the case of A Operation If capacity priority is set in sound Capacity priority setting, the fan speed will be increased according to the load of air conditioning when load is heavier. Operation sound Rated during low noise...
Page 206
Field Settings for Outdoor Unit SiUS342004EB 2.6.2 Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Description of setting Setting procedure External control adaptor for...
Page 207
SiUS342004EB Field Settings for Outdoor Unit Image of operation in the case of A Power consumption Rated The power Demand level 1 Demand level 2 Demand level 3 consumption instructing instructing instructing during the demand level 1 instructing can be set with the Power consumption set by Demand 1 level...
Field Settings for Outdoor Unit SiUS342004EB 2.6.3 Setting Procedure of Night-Time Low Noise Operation and Demand Operation 1. Setting mode 1 (H1P OFF) In setting mode 2, press the MODE (BS1) button once Setting mode 1 is entered and H1P turns OFF.
Page 209
SiUS342004EB Field Settings for Outdoor Unit To activate this operation method under heating operation, change field setting [2-9] to 0 (default). • Hi-sensible/economic (cooling/heating) The refrigerant temperature is set higher/lower (cooling/heating) compared to basic operation. The focus under high sensible mode is comfort feeling for the customer. The selection method of indoor units is important and has to be considered as the available capacity is not the same as under basic operation.
Page 210
Field Settings for Outdoor Unit SiUS342004EB In case of heating operation the condense temperature is allowed to go up to 115°F (46°C) on temporary base depending on the situation. When the request from the indoor units becomes more moderate, the system will eventually go to the steady state condition which is defined by the operation method above.
SiUS342004EB Test Operation 3. Test Operation Checks before Test Operation Before carrying out a test operation, proceed as follows: Step Action Make sure the voltage at the primary side of the safety breaker is: 518 - 632 V Fully open the liquid and the gas stop valve. Checkpoints To carry out a test operation, check the following: ...
Test Operation SiUS342004EB Low-Temperature Hydrobox Test Operation Regarding the test operation of the low-temperature hydrobox (HXY-TA), refer to the service manual SiUS392016EA. Gas Furnace Test Operation Caution Always use the remote controller to stop the test operation. The test should be performed with the following procedure. 1.
Page 213
SiUS342004EB Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............209 1.1 Indoor Unit Overall ................... 209 1.2 Low-Temperature Hydrobox Overall ............212 1.3 With Gas Furnace ..................212 1.4 Gas Furnace Lockout Reset..............212 1.5 With Infrared Presence/Floor Sensor ............213 2.
Page 214
SiUS342004EB 3.28 Remote Sensor Abnormality ..............274 3.29 Infrared Presence/Floor Sensor Error ............275 3.30 Remote Controller Thermistor Abnormality ..........280 3.31 Outdoor Unit Main PCB Abnormality............281 3.32 Detection of Ground Leakage by Leak Detection Circuit ......282 3.33 Missing of Ground Leakage Detection Core ..........283 3.34 Activation of High Pressure Switch ............
Page 215
SiUS342004EB 3.72 System Not Set Yet .................. 352 3.73 System Abnormality, Refrigerant System Address Undefined ....353 3.74 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes)............ 355 3.75 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes)............
Symptom-based Troubleshooting SiUS342004EB 1. Symptom-based Troubleshooting Indoor Unit Overall Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn OFF the power supply and then replace the fuse (s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
Page 217
SiUS342004EB Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure COOL/HEAT The remote controller displays This remote controller has no option Use a remote controller with option to selection is CENTRAL CONTROL. to select cooling operation. select cooling operation. disabled. The remote controller displays COOL/HEAT selection is made using Use the COOL/HEAT selection CENTRAL CONTROL, and the...
Page 218
Symptom-based Troubleshooting SiUS342004EB Symptom Supposed Cause Countermeasure The system Indoor unit These are operating sounds of the Normal operation. produces sounds. Immediately after turning ON electronic expansion valve of the This sound becomes low after a the power supply, indoor unit indoor unit.
SiUS342004EB Symptom-based Troubleshooting Low-Temperature Hydrobox Overall Regarding the symptom-based troubleshooting of the low-temperature hydrobox (HXY-TA), refer to the service manual SiUS392016EA. With Gas Furnace Symptom Supposed Cause The gas furnace does not start operation. The gas furnace does not start operation while the compressor is during operation or under stop-control, or right after defrost IN or defrost OUT.
Symptom-based Troubleshooting SiUS342004EB With Infrared Presence/Floor Sensor Condition Measure Louver operation different from setting or no downward airflow Refer to the flowchart below. in heating operation Individual airflow direction setting different from the actual Refer to the flowchart below. airflow direction 3 While not operating, the louver does not close completely.
SiUS342004EB Error Code via Remote Controller 2. Error Code via Remote Controller BRC1E73 The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1) Checking an error or warning.
Error Code via Remote Controller SiUS342004EB BRC1H71W Home screen When the indoor unit is in error, the controller will display Auto Cool on the home screen. Room Information screen Press and hold on the Home screen for 5 seconds. 12:34 The unit number and error code will be displayed at the bottom of the information screen.
Page 223
SiUS342004EB Error Code via Remote Controller The upper digit of the code changes as shown below. O0 A C E H F J L P U 9 8 7 6 5 4 UP button DOWN button Continuous beep: Both upper and lower digits match. (Error code is confirmed.) 2 short beeps: The upper digit matches but the lower digit does not.
Troubleshooting by Error Code SiUS342004EB 3. Troubleshooting by Error Code Error Codes and Descriptions k: ON h: OFF l: Blink Error Operation Reference Error contents code lamp page External protection device abnormality Indoor unit control PCB abnormality Drain level control system abnormality Indoor fan motor lock, overload Indoor fan motor abnormality Overload/overcurrent/lock of indoor fan motor...
Troubleshooting by Error Code SiUS342004EB Error Codes (Sub Codes) If an error code like the one shown below is displayed when a wired remote controller is in use, make a detailed diagnosis or a diagnosis of the relevant unit. 3.2.1 Indoor Unit Troubleshooting Error code Error Description...
Page 227
SiUS342004EB Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Defective combination of indoor unit PCB and the fan PCB A combination of indoor unit PCB and the fan PCB is defective. Check whether the capacity setting adaptor is Capacity setting abnormality C6 - 01 correct and the type of the fan PCB is correct.
Page 228
Troubleshooting by Error Code SiUS342004EB Troubleshooting Error code Error Description Diagnosis E7 - 01 Fan motor M1F lock (Master) Make a diagnosis of the fan motor of the relevant unit based on the following. E7 - 02 Fan motor M2F lock (Master) Fan motor lock: 01, 02, 13, 14, 25, 26 E7 - 05 Fan motor M1F momentary overcurrent (Master)
Page 229
SiUS342004EB Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis F4 - 01 Wet alarm Refer to the F4 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. F4 - 02 Wet alarm for compressor M1C (Master) F4 - 04 Wet alarm for compressor M1C (Slave 1)
Page 230
Troubleshooting by Error Code SiUS342004EB Troubleshooting Error code Error Description Diagnosis J5 - 01 Defective compressor suction thermistor (R12T) (Master) Refer to the J5 flowchart and make a diagnosis of the relevant thermistor of the relevant unit based on the Error Defective compressor suction thermistor (R12T) J5 - 03 code shown to the left.
Page 231
SiUS342004EB Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Defective heat exchanger liquid upper thermistor (R4T) Refer to the J8 flowchart and make a diagnosis of the J8 - 01 (Master) relevant thermistor of the relevant unit based on the Error code shown to the left.
Page 232
Troubleshooting by Error Code SiUS342004EB Troubleshooting Error code Error Description Diagnosis L1 - 01 IPM error: Compressor M1C (Master) Refer to the L1 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. L1 - 02 Defective current sensor 1: Compressor M1C (Master) L1 - 03...
Page 233
SiUS342004EB Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis L8 - 03 Compressor M1C overcurrent (Master) Refer to the L8 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. L8 - 06 Compressor M1C overcurrent (Slave 1) L8 - 07...
Page 234
Troubleshooting by Error Code SiUS342004EB Troubleshooting Error code Error Description Diagnosis U0 - 05 Refrigerant shortage warning (cooling) Refer to the U0 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. U0 - 06 Refrigerant shortage warning (heating) U1 - 01...
Page 235
SiUS342004EB Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Other indoor units abnormality Refer to the U9 flowchart and make a diagnosis of the U9 - 01 relevant unit based on the Error code shown to the left. Refrigerant type error The type of refrigerant used for the indoor unit is different UA - 13...
Troubleshooting by Error Code SiUS342004EB External Protection Device Abnormality 3.3.1 External Protection Device Abnormality (Except FXTQ-TA, FXTQ-TB, and CXTQ-TA) Applicable All indoor unit models (except FXTQ-TA, FXTQ-TB, and CXTQ-TA) Models Error Code Method of Error Detects open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set to...
Page 237
SiUS342004EB Troubleshooting by Error Code 3.3.2 External Protection Device Abnormality (FXTQ-TA, FXTQ-TB, CXTQ-TA Only) Applicable FXTQ-TA, FXTQ-TB, CXTQ-TA Models A0-01 Error Code Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals.
Troubleshooting by Error Code SiUS342004EB Indoor Unit Control PCB Abnormality Applicable All indoor unit models Models Error Code Method of Error Check data from EEPROM. Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.
SiUS342004EB Troubleshooting by Error Code Drain Level Control System Abnormality Applicable FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA, Models FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA (Option) Error Code Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF. Conditions Supposed ...
Page 240
Troubleshooting by Error Code SiUS342004EB The drain pump works when the Check the drain piping for power supply is reset for the clogging or upward slope, etc. indoor unit. voltage of drain pump terminals (
2) is in accordance to the criteria Replace the indoor unit control (
3) (within 5 minutes of PCB (A1P).
SiUS342004EB Troubleshooting by Error Code Indoor Fan Motor Lock, Overload Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ05-48TA, FXSQ05-48TB, Models FXMQ07-12PB, FXMQ15-24TB, FXAQ-P Error Code Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase...
Page 242
Troubleshooting by Error Code SiUS342004EB Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. Are there any foreign Remove the foreign matter.
SiUS342004EB Troubleshooting by Error Code Indoor Fan Motor Abnormality 3.7.1 Indoor Fan Motor Abnormality (FXFQ-AA Models) Applicable FXFQ-AA Models Error Code Method of Error Detection from the current flow on the PCB (A1P) Detection Detection from the current flow on the PCB when the fan motor starting operation Error Decision ...
Page 244
Troubleshooting by Error Code SiUS342004EB The HAP lamp on the indoor unit Replace the indoor unit control control PCB is PCB (A1P). blinking. Replace the fan motor (M1F). 1. Check also if the relay connector between the indoor unit control PCB and the fan motor are correctly connected.
Page 245
SiUS342004EB Troubleshooting by Error Code 3.7.2 Indoor Fan Motor Abnormality (FXDQ-M, FXHQ-M Models) Applicable FXDQ-M, FXHQ-M Models Error Code Method of Error This error is detected if there is no revolution detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan Conditions Supposed...
Page 246
Troubleshooting by Error Code SiUS342004EB 3.7.3 Indoor Fan Motor Abnormality (FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB, FXMQ-TA Models) Applicable FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB, FXMQ-TA Models Error Code Method of Error Error from the current flow on the fan PCB Detection Error from the rotation speed of the fan motor in operation ...
Page 247
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a foreign matter around Remove the foreign matter.
Page 248
Troubleshooting by Error Code SiUS342004EB resistance among U, V, and W Replace the indoor fan motor (M1F). are unbalanced or short circuited. CHECK 17 Remove the signal connector from the fan motor and check the resistance. Between Vcc and GND terminals, and Replace the indoor fan motor (M1F).
SiUS342004EB Troubleshooting by Error Code Overload/Overcurrent/Lock of Indoor Fan Motor Applicable FXMQ-M Models Error Code Outline This error is detected by detecting that the individual power supply for the fan turns OFF. Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.
Troubleshooting by Error Code SiUS342004EB Blower Motor Not Running Applicable FXTQ-TA, FXTQ-TB Models Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor. If that figure falls below 50 rpm for the specified number of consecutive times successively, it is deemed abnormal operation.
SiUS342004EB Troubleshooting by Error Code 3.10 Indoor Fan Motor Status Abnormality Applicable FXTQ-TA, FXTQ-TB Models A6-20 Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.
Troubleshooting by Error Code SiUS342004EB 3.11 Low Indoor Airflow Applicable FXTQ-TA, FXTQ-TB Models A6-21 Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision ...
SiUS342004EB Troubleshooting by Error Code 3.12 Swing Flap Motor Abnormality Applicable FXHQ-M, FXAQ-P Models Error Code Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap Conditions motor is energized for a specified amount of time (about 30 seconds).
Page 254
Troubleshooting by Error Code SiUS342004EB The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective swing from the swing motor, operation motor. (∗2) is normal when turned ON again.
SiUS342004EB Troubleshooting by Error Code 3.13 Power Supply Voltage Abnormality Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Models Error Code Method of Error Error is detected by checking the input voltage of the fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed ...
Troubleshooting by Error Code SiUS342004EB 3.14 Blower Motor Stops for Over/Under Voltage Applicable FXTQ-TA, FXTQ-TB Models Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.
SiUS342004EB Troubleshooting by Error Code 3.15 Electronic Expansion Valve Coil Abnormality, Dust Clogging Applicable All indoor unit models Models Error Code Method of Error Check coil condition of electronic expansion valve by using microcomputer. Detection Check dust clogging condition of electronic expansion valve main body by using microcomputer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Troubleshooting by Error Code SiUS342004EB 3.16 Gas Furnace Abnormality Applicable CXTQ-TA Models AA-03 Error Code Method of Error Detects the error signal from the gas furnace when any error occurs on the gas furnace. The indoor Detection unit displays AA-03 for any sort of gas furnace abnormality. Error Decision The error status differs depending on each error code of the gas furnace.
SiUS342004EB Troubleshooting by Error Code 3.17 Drain Level above Limit Applicable FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA, Models FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA (Option) Error Code Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation.
Troubleshooting by Error Code SiUS342004EB 3.18 Self-Cleaning Decoration Panel Abnormality Applicable FXFQ-AA (when self-cleaning decoration panel BYCQ54EEGFU is installed) Models FXFQ-T (when self-cleaning decoration panel BYCQ125BGW1 is installed) Error Code Method of Error Error is detected by abnormal signal from the self-cleaning decoration panel. Detection Error Decision Any of the following conditions is met while the unit is in operation.
Page 261
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the transmission between self-cleaning decoration panel Go to Diagnosis Flowchart-1. and indoor unit (Transmission error between normal? self-cleaning decoration panel and indoor unit)
Page 262
Troubleshooting by Error Code SiUS342004EB Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-1 AH-03 Transmission error between self-cleaning decoration panel and indoor unit Is the connector (
1) on the indoor unit control Properly connect the PCB properly connected? connector.
Page 263
SiUS342004EB Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-2 AH-04 Dust detection sensor error Is the connector X12A on the self-cleaning decoration panel PCB Properly connect the properly connected? connector.
Page 264
Troubleshooting by Error Code SiUS342004EB Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-3 AH-05 Dust collection sign error Is the inside of dust collection port clogged Clean the dust from the inside by dust? of dust collection port.
Page 265
SiUS342004EB Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-4 AH-06 Air filter rotation error Is the filter Properly attached the filter. properly attached? Is there any foreign matter in the filter Remove the foreign matter.
Page 266
Troubleshooting by Error Code SiUS342004EB From the previous page Start operation with remote controller. Error AH recurs, Normal. or the self-cleaning decoration panel lamp (red) blinks? The error could be caused by other causes. Refer to other diagnosis flowcharts in the following order: AH-05→03→04→07→08→09.
Page 267
SiUS342004EB Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-5 AH-07 Damper rotation error Is the damper Properly attached the damper. properly attached? Is there any foreign matter in the damper Remove the foreign matter.
Page 268
Troubleshooting by Error Code SiUS342004EB From the previous page Start operation with remote controller. Error AH recurs, Normal. or the self-cleaning decoration panel lamp (red) blinks? The error could be caused by other causes. Refer to other diagnosis flowcharts in the following order: AH-05→03→04→06→08→09.
Page 269
SiUS342004EB Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-6 AH-08 Filter auto clean operation error Is there any external factor other than the Remove the external factor.
Page 270
Troubleshooting by Error Code SiUS342004EB Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-7 AH-09 Filter auto clean operation start disabled error Has any air conditioning operation been Stop the air conditioning running continuously for operation and perform filter...
SiUS342004EB Troubleshooting by Error Code 3.19 Defective Capacity Setting Applicable All indoor unit models Models Error Code Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit control PCB, and whether the value is normal or abnormal is determined.
Troubleshooting by Error Code SiUS342004EB 3.20 Transmission Abnormality between Indoor Unit Control PCB and Fan PCB Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA Models Error Code Method of Error Transmission conditions between the indoor unit control PCB (A1P) and fan PCB (A2P) are Detection checked via microcomputer.
Page 273
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the connector between indoor unit control PCB Connect the connector (A1P) and fan PCB accurately.
Troubleshooting by Error Code SiUS342004EB 3.21 Blower Motor Communication Error Applicable FXTQ-TA, FXTQ-TB Models C1-07 Error Code Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.
SiUS342004EB Troubleshooting by Error Code 3.22 Climate Talk Communication Error Applicable CXTQ-TA Models C1-08 Error Code Method of Error Monitors the communication with the gas furnace connected to the Climate Talk Communication Detection terminal. Error Reset The error decision is made when the communication with the gas furnace is lost after once the Conditions initial setting for communication with the gas furnace completes.
Troubleshooting by Error Code SiUS342004EB 3.23 Thermistor Abnormality Applicable C4, C5: All indoor units Models C9: except FXTQ-TA, FXTQ-TB, and CXTQ-TA models CA: FXMQ-PB models only C4, C5, C9, CA Error Code Method of Error The error is determined by the temperature detected by the thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.
SiUS342004EB Troubleshooting by Error Code 3.24 Combination Error between Indoor Unit Control PCB and Fan PCB Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-TA Models Error Code Method of Error Check the condition of transmission with fan PCB (A2P) using indoor unit control PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect.
Troubleshooting by Error Code SiUS342004EB 3.25 Capacity Setting Abnormality Applicable FXMQ-TA Models C6-01 Error Code Method of Error This error is detected by checking communication between the PCB (A1P) and the fan Detection microcomputer. Error Decision Based on the communication data, decide whether the combination of capacity setting and the Conditions type of fan driver is correct.
SiUS342004EB Troubleshooting by Error Code 3.26 Blower Motor HP Mismatch Applicable FXTQ-TA, FXTQ-TB Models C6-01 Error Code Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...
Troubleshooting by Error Code SiUS342004EB 3.27 Indoor Blower Does Not Have Required Parameters to Function Applicable FXTQ-TA, FXTQ-TB Models C6-02 Error Code Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.
SiUS342004EB Troubleshooting by Error Code 3.28 Remote Sensor Abnormality Applicable FXTQ-TA, FXTQ-TB, CXTQ-TA Models Error Code Method of Error The error is detected by remote sensor temperature. Detection Error Decision When the remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed ...
Troubleshooting by Error Code SiUS342004EB 3.29 Infrared Presence/Floor Sensor Error Applicable FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA Models Error Code Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart.
Page 283
SiUS342004EB Troubleshooting by Error Code Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the connector on infrared presence Connect the connector correctly. sensor PCB and the connector (
1) normal? Is the connection of the Connect the connector correctly.
Page 284
Troubleshooting by Error Code SiUS342004EB Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector (
1) normal? Is the connection of the Connect the connector correctly.
Page 285
SiUS342004EB Troubleshooting by Error Code Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector (1) normal? Is the connection of the Connect the connector correctly.
Page 286
Troubleshooting by Error Code SiUS342004EB Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector (
1) normal? Is the connection of the Connect the connector correctly.
SiUS342004EB Troubleshooting by Error Code 3.30 Remote Controller Thermistor Abnormality Applicable All indoor unit models Models Error Code Method of Error Error detection is carried out by the temperature detected by the remote controller thermistor. Detection Error Decision The remote controller thermistor becomes disconnected or shorted while the unit is running. Conditions ...
Troubleshooting by Error Code SiUS342004EB 3.31 Outdoor Unit Main PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions...
SiUS342004EB Troubleshooting by Error Code 3.32 Detection of Ground Leakage by Leak Detection Circuit Applicable All outdoor unit models Models Error Code Sub code: 01-03 Method of Error Detect leakage current in the ground leakage detection circuit and detect error on the outdoor unit Detection main PCB.
Troubleshooting by Error Code SiUS342004EB 3.33 Missing of Ground Leakage Detection Core Applicable All outdoor unit models Models Error Code Sub code: 06-08 Method of Error Error is detected according to whether or not there is continuity across the connector X101A for Detection leakage detection circuit (Q1LD).
SiUS342004EB Troubleshooting by Error Code 3.34 Activation of High Pressure Switch Applicable All outdoor unit models Models Error Code Method of Error Detect continuity across the high pressure switch in the protection device circuit. Detection Error Decision When part of the protection device circuit opens. Conditions (Reference) Operating pressure of the high pressure switch: ...
Page 292
Troubleshooting by Error Code SiUS342004EB CHECK 12 Compare the voltage measurement of the connector of the pressure sensor (
1) with the Replace the high pressure sensor measurement of the pressure (S1NPH). gauge. Are the characteristics of the (
1) Use the table on CHECK 12 to high pressure convert the voltage measurement into sensor...
SiUS342004EB Troubleshooting by Error Code 3.35 Activation of Low Pressure Sensor Applicable All outdoor unit models Models Error Code Method of Error Make judgment of pressure detected by the low pressure sensor with the outdoor unit main PCB. Detection Error Decision When low pressure caused a drop while the compressor is in operation: Conditions ...
Troubleshooting by Error Code SiUS342004EB 3.36 Compressor Motor Lock Applicable All outdoor unit models Models Error Code Method of Error Inverter PCB takes the position signal from UVW line connected between the inverter and Detection compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
Page 295
SiUS342004EB Troubleshooting by Error Code The insulation resistance of the relevant Replace the compressor. compressor is low (< 100 k:) Power OFF The internal wiring of the compressor coil is defective. Restart the compressor, and then check for the Quit work. operation.
Troubleshooting by Error Code SiUS342004EB 3.37 Compressor Damage Alarm Applicable All outdoor unit models Models Error Code Method of Error Determine the symptom to be error by detecting the revolutions of the compressor and pressure Detection values detected by the high and low pressure sensors, and further making a comparison between a theoretical current value of the compressor calculated from parameters detected and an actual current value detected by the power transistor.
Page 297
SiUS342004EB Troubleshooting by Error Code the high pressure and ow pressure checked by the service checker the Replace the outdoor unit main same as the actual measured PCB (A1P). values of the high and low pressure sensors? CHECK 4 Is the power transistor Replace the inverter PCB normal? (A4P).
Troubleshooting by Error Code SiUS342004EB 3.38 Outdoor Fan Motor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detects according to the value of current flowing through the fan PCB. Detection Error Decision Overcurrent is detected from the fan PCB (Detecting overcurrent 4 times will shut down the Conditions system).
Page 299
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode Outdoor units are equipped with 2 fan motors. Check for M1F or M2F applicable to the error code E7 while in monitor mode of the outdoor unit.
Page 300
Troubleshooting by Error Code SiUS342004EB The fan cannot be rotated by hand when Replace the relevant fan motor disconnecting the connector from the (M1F, M2F). fan motor. Resistance between the fan motor power supply cable Replace the relevant fan motor terminal and the motor (M1F, M2F).
SiUS342004EB Troubleshooting by Error Code 3.39 Electronic Expansion Valve Coil Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detects according to whether or not there is continuity across the electronic expansion valve coils. Detection Error Decision When no current flows through common (COM[+]) at the time of turning ON the power supply.
Troubleshooting by Error Code SiUS342004EB 3.40 Discharge Pipe Temperature Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to temperature detected with the discharge pipe or compressor body thermistor. Detection Error Decision When discharge pipe temperature becomes abnormally high (i.e., 135°C (275°F) or more) Conditions ...
Page 303
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Reset the system operation, and then restart it. CHECK 11 Are the characteristics of the discharge pipe and Replace the relevant thermistor.
Troubleshooting by Error Code SiUS342004EB 3.41 Wet Alarm Applicable All outdoor unit models Models Error Code Method of Error In cooling operation, detect the condition under which liquid refrigerant returns to the compressor, Detection according to the temperature and pressure of each part. Error Decision When the following wet state continues for a period of 90 minutes, an alert is issued.
Page 305
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Mount a pressure gauge on the high pressure service port. Reset the operation, and then restart the operation. Are the characteristics of the suction pipe...
Troubleshooting by Error Code SiUS342004EB 3.42 Refrigerant Overcharged Applicable All outdoor unit models Models Error Code Method of Error Detect overcharged refrigerant according to outdoor air temperature, heat exchanger deicer Detection temperature, and liquid pipe temperature during check operation. Error Decision When the amount of refrigerant, which is calculated using outdoor air temperature, heat exchanger Conditions deicer temperature, and liquid pipe temperature during check operation, exceeds the regular...
SiUS342004EB Troubleshooting by Error Code 3.43 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Applicable All outdoor unit models Models Error Code Method of Error Check for the transmission conditions of the harnesses between the PCBs using microcomputer. Detection Error Decision Normal transmission between the PCBs is disabled while the compressor is not running.
Troubleshooting by Error Code SiUS342004EB 3.44 Outdoor Fan PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect with current sensor value. Detection Error Decision When the current sensor shows abnormality. Conditions Supposed Defective fan PCB (A5P, A6P) Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting...
SiUS342004EB Troubleshooting by Error Code 3.45 Thermistor Abnormality Applicable All outdoor unit models Models H9, J3, J5, J6, J7, J8, J9 Error Code Method of Error Detect according to temperature detected with individual thermistors. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed ...
Page 310
Troubleshooting by Error Code SiUS342004EB Note(s) 1. Error codes and thermistors Error Applicable Thermistor Electric symbol Connector Code Outdoor air thermistor X18A Discharge pipe (M1C) thermistor R21T X19A (Group connector) Compressor body thermistor R14T Compressor suction thermistor X15A R12T (Group connector) Suction pipe thermistor X29A R10T...
SiUS342004EB Troubleshooting by Error Code 3.46 High Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detects according to temperature detected with the high pressure sensor. Detection Error Decision The high pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-4.3 MPa (0-624 psi)) Supposed...
Troubleshooting by Error Code SiUS342004EB 3.47 Low Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to temperature detected with the low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-1.7 MPa (0-247 psi)) Supposed...
SiUS342004EB Troubleshooting by Error Code 3.48 Inverter PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to current value detected during the output of waveform before compressor Detection startup Detect according to current value detected with the current sensor during synchronous operation for startup Error Decision ...
Page 314
Troubleshooting by Error Code SiUS342004EB Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply once, and then turn it ON again. The error could have resulted from Return to normal? external factors other than failures (e.g.
SiUS342004EB Troubleshooting by Error Code 3.49 Momentary Power Failure during Test Operation Applicable All outdoor unit models Models Error Code Method of Error Momentary power failure is detected by the PCB. Detection Error Decision Judgment is made by AC power frequency detection circuit on the outdoor unit main PCB. Conditions Supposed ...
Troubleshooting by Error Code SiUS342004EB 3.50 Inverter Radiation Fin Temperature Rise Abnormality 3.50.1 Inverter Radiation Fin Temperature Rise Abnormality (Inverter PCB) Applicable All outdoor unit models Models Error Code Sub code: 01-03 Method of Error Detect temperature of power module of the inverter PCB. Detection Error Decision Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
Page 317
SiUS342004EB Troubleshooting by Error Code 3.50.2 Inverter Radiation Fin Temperature Rise Abnormality (Fan PCB) Applicable All outdoor unit models Models Error Code Sub code: 06, 07, 18-21 Method of Error Fan PCB radiation fin temperature is detected by the thermistor located inside the fan PCB circuit. Detection Error Decision Detected temperature exceeds a certain level.
Troubleshooting by Error Code SiUS342004EB 3.51 Compressor Instantaneous Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision When overcurrent flows instantaneously through the power transistor. Conditions Supposed ...
Page 319
SiUS342004EB Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB (A4P). Restarting the system results Continue operation. in the recurrence of the error. The error could have resulted from causes such as instantaneous power failure.
Troubleshooting by Error Code SiUS342004EB 3.52 Compressor Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision When the secondary-side inverter current exceeds. Conditions Supposed Compressor overloaded Causes ...
Page 321
SiUS342004EB Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB (A4P). Restarting the system results in Continue operation. the recurrence of the The error could have error. resulted from causes such as instantaneous power failure.
Troubleshooting by Error Code SiUS342004EB 3.53 Compressor Startup Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect error according to the signal waveform of compressor. Detection Error Decision When compressor startup operation has not been completed. Conditions Supposed ...
Page 323
SiUS342004EB Troubleshooting by Error Code Refrigerant is stagnated. (The unit is out Solve the refrigerant stagnation. of power supply for more (Power should be supplied for more than 6 hours.) than 6 hours.) Is the insulation resistance of the Replace the compressor. relevant compressor 100 kΩ...
Troubleshooting by Error Code SiUS342004EB 3.54 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Applicable All outdoor unit models Models Error Code Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
Page 325
SiUS342004EB Troubleshooting by Error Code microcomputer normal monitor indication This is not the LC error. lamp (green) on the outdoor Recheck the error code. unit main PCB (A1P) is blinking. microcomputer normal monitor indication The fuse of the Replace the inverter PCB (
2). lamp (green) on the outdoor noise filter PCB has unit main PCB (A1P) is...
Troubleshooting by Error Code SiUS342004EB 3.55 Power Supply Voltage Imbalance Applicable All outdoor unit models Models Error Code Method of Error Detect voltage imbalance through inverter PCB. Detection Error Decision When power supply voltage imbalance exceeds approximately 12 V. Conditions Error is not decided while the unit operation is continued.
Page 327
∗ Use the document “Notice of Inspection Results” attached to spare part. Explanation to users Be sure to explain user that “power supply Hand the “Notice of Inspection Results” to user to ask voltage imbalance” will occur and Daikin him/her to rectify the imbalance. accepts no responsibility for the imbalance. Note(s) 1.
Troubleshooting by Error Code SiUS342004EB 3.56 Inverter Radiation Fin Temperature Abnormality 3.56.1 Inverter Radiation Fin Temperature Abnormality (Inverter PCB) Applicable All outdoor unit models Models Error Code Sub code: 09-11 Method of Error Detect the resistance of the following thermistors while the compressor is not running: Detection ...
Page 329
SiUS342004EB Troubleshooting by Error Code 3.56.2 Inverter Radiation Fin Temperature Abnormality (Fan PCB) Applicable All outdoor unit models Models Error Code Sub code: 02, 03, 15-18 Method of Error Detects the resistance of the thermistor located inside the fan PCB circuit while the fan motor is not Detection in operation.
Troubleshooting by Error Code SiUS342004EB 3.57 Field Setting Abnormality after Replacing Outdoor Unit Main PCB or Combination of PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error This error is detected according to communications with the inverter PCB. Detection Error Decision Make judgement according to communication data on whether or not the type of the inverter PCB is...
SiUS342004EB Troubleshooting by Error Code 3.58 Refrigerant Shortage Applicable All outdoor unit models Models Error Code Method of Error Detect refrigerant shortage according to a low pressure level or a difference in heat exchanging Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.
Troubleshooting by Error Code SiUS342004EB 3.59 Reverse Phase, Open Phase Applicable All outdoor unit models Models Error Code Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged. Error Decision When a power supply is reverse phase, or T-phase is open phase.
SiUS342004EB Troubleshooting by Error Code 3.60 Power Supply Insufficient or Instantaneous Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect the voltage of capacitor of the main circuit in the inverter PCB. Detection Error Decision When the voltage in the DC circuit (between diode module and power module) falls below 560 Conditions VDC.
Page 334
Troubleshooting by Error Code SiUS342004EB The insulation resistance of the fan Replace the fan motor motor is less than (M1F, M2F). 1 M:. If the motor gets severely damaged, the inverter PCB should also be replaced. CHECK 4 Is the power Replace the inverter PCB transistor normal? (A4P).
SiUS342004EB Troubleshooting by Error Code 3.61 Check Operation Not Executed Applicable All outdoor unit models Models Error Code Method of Error The check operation has not been executed. Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation not executed.
Troubleshooting by Error Code SiUS342004EB 3.62 Transmission Error between Indoor Units and Outdoor Units, Open Phase in Power Supply Wiring Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time.
Page 337
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for details of error in monitor mode. U4-01 Refer to troubleshooting U4-03 (Indoor unit system transmission error) Check the power supply wiring.
Page 338
Troubleshooting by Error Code SiUS342004EB Are the indoor-outdoor and outdoor-outdoor Modify the transmission transmission wirings wirings. normal? Disconnect the outdoor-outdoor transmission wiring. Replace the outdoor unit main Does the system normally PCB (A1P). operate with a single transmission line? Mount the DIII-NET extension adaptor.
SiUS342004EB Troubleshooting by Error Code 3.63 Transmission Error between Remote Controller and Indoor Unit Applicable All indoor unit models Models Error Code Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time.
Troubleshooting by Error Code SiUS342004EB 3.64 Transmission Error between Outdoor Units Applicable All outdoor unit models Models Error Code Method of Error Microcomputer checks if transmission between outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed ...
Page 341
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: U7-01 Error code Sub code...
Page 342
Troubleshooting by Error Code SiUS342004EB Diagnosis Flowchart-1 U7-01 Error code Sub code (Transmission error when the external control adaptor is mounted) there any wiring disconnection or wiring error in the transmission Modify the transmission wirings wirings to the external to the external control adaptor for control adaptor for outdoor unit.
Page 343
SiUS342004EB Troubleshooting by Error Code Diagnosis Flowchart-2 U7-02 Error code Sub code (Transmission error when the external control adaptor for outdoor unit is mounted) Unified Cool/Heat Set Cool/Heat selection selection for the external control adaptor for outdoor unit to “IND.” Cool/Heat selection for the external control adaptor...
Page 344
Troubleshooting by Error Code SiUS342004EB Diagnosis Flowchart-3 U7-03 Error code Sub code (Transmission error between master and slave 1) multi transmission wirings to multi slave 1 have Replace the outdoor unit main caused wiring disconnection in PCB (A1P) for multi slave 1. them or are being disconnected.
Page 345
SiUS342004EB Troubleshooting by Error Code Diagnosis Flowchart-6 U7-06 Error code Sub code (Manual address setting error for slave 1, 2) One of outdoor unit multi transmission wirings has Replace the outdoor unit main caused wiring disconnection in it PCB (A1P). or been disconnected.
Troubleshooting by Error Code SiUS342004EB 3.65 Transmission Error between Main and Sub Remote Controllers Applicable All indoor unit models Models Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.
SiUS342004EB Troubleshooting by Error Code 3.66 Transmission Error between Indoor Units and Outdoor Units in the Same System Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned...
Troubleshooting by Error Code SiUS342004EB 3.67 Improper Combination of Indoor Unit and Outdoor Unit, Indoor Unit and Remote Controller Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units connected is out of the allowable range.
Page 349
SiUS342004EB Troubleshooting by Error Code Diagnosis Flowchart-1 UA-17 Error code Sub code Is the number of indoor model of indoor units connected to the Replace the outdoor unit main unit FXTQ-TA or same system is less PCB (A1P). FXTQ-TB? than 64. Incorrect electric heater capacity setting...
Page 350
Troubleshooting by Error Code SiUS342004EB Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the outdoor unit different model Replace the outdoor unit main main PCB replaced with of outdoor unit is PCB (A1P).
Page 351
SiUS342004EB Troubleshooting by Error Code Diagnosis Flowchart-5 UA-29 Error code Sub code Is there any branch selector Incorrect system setup. unit connected? Check if system is heat pump or heat recovery. Was the outdoor unit main Replace the outdoor unit main PCB PCB replaced with (A1P).
Page 352
Troubleshooting by Error Code SiUS342004EB Diagnosis Flowchart-6 UA-35 Error code Sub code Is the multi combination of Correct the multi combination of outdoor units outdoor units. proper? Was the outdoor unit main PCB replaced with a spare Replace the outdoor unit main PCB (A1P).
SiUS342004EB Troubleshooting by Error Code 3.68 Incorrect Gas Furnace Connecting Number Applicable CXTQ-TA Models Error Code Outline Two or more "CXTQ-TA + gas furnace" and other indoor units other than CXTQ-TA are connected. Error Decision Check that two or more "CXTQ-TA + gas furnace" and other indoor units other than CXTQ-TA are Conditions not connected.
Troubleshooting by Error Code SiUS342004EB 3.69 Incorrect Electric Heater Capacity Setting Applicable FXTQ-TA, FXTQ-TB Models UA-17 Error Code Outline After attaching optional electric heater, if the electric heater capacity setting (11 (21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.
SiUS342004EB Troubleshooting by Error Code 3.70 Address Duplication of Centralized Controller Applicable All indoor unit models Models Centralized controller Error Code Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.
Troubleshooting by Error Code SiUS342004EB 3.71 Transmission Error between Centralized Controller and Indoor Unit Applicable All indoor unit models Models Centralized controller Schedule timer intelligent Touch Controller Error Code Method of Error Microcomputer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 357
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is the transmission error UE caused on all Go to the next page.
Page 358
Troubleshooting by Error Code SiUS342004EB Check the transmission wiring between centralized controller for Correct the wiring. any broken wire. CHECK 15 Check the transmission wiring between main centralized Correct the wiring. controller for any broken wire. CHECK 15 Has the main centralized controller setting connector Correct the connection of the...
SiUS342004EB Troubleshooting by Error Code 3.72 System Not Set Yet Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.
Troubleshooting by Error Code SiUS342004EB 3.73 System Abnormality, Refrigerant System Address Undefined Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error System detects an indoor unit whose address is not defined by automatic address function. Detection *Automatic address refers to the automatic designated address of indoor unit and outdoor unit when connected to the power after installation or wiring replacement (with the RETURN (BS3)
Page 361
SiUS342004EB Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does electricity an error being introduced occur even after for the first time after 12 minutes elapses installation or after an indoor from the time when electricity Normal...
Troubleshooting by Error Code SiUS342004EB 3.74 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes) Applicable CXTQ-TA Models UH-05 Error Code Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established before elapsing 4 Conditions minutes after the power is turned ON.
SiUS342004EB Troubleshooting by Error Code 3.75 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) Applicable CXTQ-TA Models UH-06 Error Code Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established once the initial Conditions setting for communication with the gas furnace completes and after elapsing 4 minutes after the...
Check SiUS342004EB 4. Check Regarding the check of the low-temperature hydrobox (HXY-TA), refer to the service manual SiUS392016EA. High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Stop valve closed Check to be sure the stop valve is open. Local High pipe pressure...
SiUS342004EB Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points [In cooling] Defective low pressure Is the pressure value checked with the Service Checker (1.) Defective sensor corresponding to the measurement value of the pressure sensor? compressor Defective outdoor unit Defective...
Page 366
Check SiUS342004EB Reference CHECK 7 Refer to page 364. Reference CHECK 8 Refer to page 365. Part 6 Service Diagnosis...
SiUS342004EB Check Superheat Operation Check CHECK 3 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points Hot gas circuit clogging Defective hot Defective solenoid gas bypass Are the coil resistance and insulation normal? valve coil control Defective solenoid valve body (1)
Page 368
Check SiUS342004EB 4. Judgment criteria of superheat operation: (1) Suction gas superheating degree: 10°C (18°F) and over. (2) Discharge gas superheating degree: 45°C (81°F) and over, except immediately after compressor starts up or is running under dropping control. (Use the above values as a guide. Depending on the other conditions, the unit may be normal despite the values within the above range.) Reference CHECK 7 Refer to page 364.
SiUS342004EB Check Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. Preparation h Multimeter Prepare the analog type of multimeter. For the digital type of multimeter, those with diode check function are available for the checking.
Check SiUS342004EB Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of refrigerant overcharge 1.
SiUS342004EB Check Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of shortage of refrigerant 1.
Check SiUS342004EB Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for Normal vacuuming and dehydration described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for Special vacuuming and dehydration described below.
SiUS342004EB Check Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat Indoor heat Suction air Discharge air exchanger (liquid) exchanger (gas) thermistor thermistor Model thermistor thermistor FXFQ-AA Type A — Type C FXFQ-T Type J — FXZQ-TA — Type B FXZQ-TB —...
Page 374
Check SiUS342004EB Thermistor temperature Resistance (k) (°C) (°F) Type A Type B Type C –30 –22 363.8 — — –25 –13 266.8 — — –20 –4 197.8 — — –15 148.2 — — –10 112.0 111.1 111.8 –5 85.52 84.95 85.42 65.84 65.53...
Page 375
SiUS342004EB Check Thermistor temperature Resistance (k) (°C) (°F) Type E Type H Type J –30 –22 357.9 3407 352.1 –25 –13 263.5 2540 261.2 –20 –4 196.1 1910 195.4 –15 147.4 1449 147.3 –10 111.8 1108 111.8 –5 85.53 853.8 85.49 66.00 662.7...
SiUS342004EB Check 4.10 Broken Wire Check of the Relay Wires CHECK 15 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in the outdoor unit A that is farthest from the central remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter.
Page 378
Check SiUS342004EB 1. Short circuit between the outdoor-outdoor unit terminal parts. Outdoor-outdoor unit 2. Short circuit between transmission wiring the indoor-outdoor unit 2. Check the transmission terminal parts. wiring for continuity. Indoor-outdoor unit If there is continuity, the transmission wiring indoor-outdoor unit transmission has no broken wires in it.
SiUS342004EB Check 4.11 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Check the fan motor connector according to the following procedure. Outdoor Unit 1. Turn OFF the power supply. 2. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.
Page 380
Check SiUS342004EB FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Remove the X1A connector from the fan PCB (A2P) and measure the resistance between the U and V, V and W, and W and U phases of the motor connector (with five conductors) and check that each phase are balanced (within a permissible dispersion range of ±20%).
SiUS342004EB Check 4.13 Electronic Expansion Valve Coil Check CHECK 18 Measure the connector pin-to-pin resistance and make sure that the resistance value is within the range listed in the table below. Determine the type according to the connector wire color and measure the resistance. Outdoor Unit Y1E, Y3E, Y4E White (1)
Check SiUS342004EB 4.14 Fan Motor Connector Check for FXTQ-TA, FXTQ-TB CHECK 19 CHECKING EMERSON ULTRATECH ECM MOTORS The FXTQ-TA and FXTQ-TB models utilize an Emerson, 4-wire variable speed ECM blower motor. The ECM blower motor provides constant CFM. The motor is a serially communicating variable speed motor. Only four wires are required to control the motor: +Vdc, Common, Receive, and Transmit.
Page 387
SiUS342004EB Check The green LED on the diagnostic tool will blink indicating communications between the tool and motor. See table below for indications of tool indicators and motor actions. Replace or repair as needed. Power Green Motor Indication(s) Button Action Confirm 24VAC to UltraCheck-EZ tool.
Page 388
Check SiUS342004EB Electrical Checks - Low Voltage Control Circuits Turn on power to air handler or modular. Warning Line Voltage now present. Check voltage between pins on the 4-wire motor control harness between the motor and control board. Voltage on pins should read: Pins 1 to 4 = 3.3vdc Pins 1 to 2 = 3.3vdc Pins 3 to 4 = 15vdc...
Page 389
SiUS342004EB Check Locate the 3-circuit connector in the control/end bell. Using an ohmmeter, check the resistance between each terminal in the connector. If the resistance is 1 M or greater, the control/end bell is functioning properly. Replace the control/end bell if the resistance is lower than 1 M.
Page 390
SiUS342004EB Part 7 Appendix 1. Wiring Diagrams..................384 1.1 Outdoor Unit ..................... 384 1.2 Indoor Unit....................386 1.3 Air Treatment Equipment ................. 409 Part 7 Appendix...
Wiring Diagrams SiUS342004EB Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72/96MFVJU Part 7 Appendix...
Page 417
SiUS342004EB Wiring Diagrams 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Part 7 Appendix...
Page 418
Wiring Diagrams SiUS342004EB VAM1200GVJU Part 7 Appendix...
Page 419
Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. z Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.