Mitsubishi Heavy Industries FDU Series Service Manual
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Mitsubishi Heavy Industries FDU Series Service Manual

Mitsubishi Heavy Industries FDU Series Service Manual

Standard inverter packaged air-conditioners
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SERVICE MANUAL
STANDARD INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILINING CASSETTE-4 WAY TYPE
FDT90VNPWVH
100VNPWVH
DUCT CONNECTED-LOW/MIDDLE
STATIC PRESSURE TYPE
FDUM90VNPWVH
100VNPWVH
WALL MOUNTED TYPE
SRK100VNPWZR
Manual No.'19・PAC-SM-334
updated June 16, 2021
DUCT CONNECTED-HIGH STATIC
PRESSURE TYPE
FDU90VNPWVH
100VNPWVH
CEILING SUSPENDED TYPE
FDE90VNPWVH
100VNPWVH

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Summary of Contents for Mitsubishi Heavy Industries FDU Series

  • Page 1 Manual No.'19・PAC-SM-334 updated June 16, 2021 SERVICE MANUAL STANDARD INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type) CEILINING CASSETTE-4 WAY TYPE DUCT CONNECTED-HIGH STATIC PRESSURE TYPE FDT90VNPWVH 100VNPWVH FDU90VNPWVH 100VNPWVH DUCT CONNECTED-LOW/MIDDLE CEILING SUSPENDED TYPE STATIC PRESSURE TYPE FDE90VNPWVH FDUM90VNPWVH 100VNPWVH...
  • Page 2 '19 • PAC-SM-334 TABLE OF CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ....3 1.1 Remote control (Option parts) ..............3 1.2 Operation control function by the wired remote control ......7 1.3 Operation control function by the indoor control ........10 1.4 Operation control function by the outdoor control ........39 (1) Compressor speed ..................39 (2) Compressor protection start ...............39 (3) Outdoor fan control ..................39...
  • Page 3 '19 • PAC-SM-334 2.2 SRK series ....................109 (1) Cautions ....................109 (2) Items to check before troubleshooting ............109 (3) Troubleshooting procedure (If the air-conditioner does not run at all) ..109 (4) Troubleshooting procedure (If the air-conditioner runs) ......110 (5) Self-diagnosis table ..................111 (6) Service mode (Trouble mode access function) ........112 (7) Inspection procedures corresponding to detail of trouble ......120 (8) Phenomenon observed after short-circuit, wire breakage on sensor ..122...
  • Page 4 '16 • PAC-T-251 '19 • PAC-SM-334 1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 Remote control (Option parts) 1.10.1 Remote control (1) Wired remote control Wired remote control Model RC-EX3A Model RC-EX3A ⑤ LCD (with backlight) ③...
  • Page 5 '19 • PAC-SM-334 Wired remote control Model RC-E5 The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation Characters displayed with dots in the liquid crystal display area are abbreviated.
  • Page 6 '16 • PAC-T-251 '16 • PAC-T-251 '19 • PAC-SM-334 Wireless remote control Wireless remote control (2) Wireless remote control (a) RCN-E2 (Except SRK series) Indication section Indication section ① OPERATION MODE display Indicates selected operation mode. SET TEMP display Indicates set temperature. SLEEP TIMER time display Indicates the amount of time remaining on the sleep timer.
  • Page 7 '19 • PAC-SM-334 (b) SRK series only Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the Press to start operation, press again mode changes. to stop. TEMPERATURE button FAN SPEED button This button sets the room temperature. Each time the button is pressed, the fan speed changes.
  • Page 8 '16 • PAC-T-251 '19 • PAC-SM-334 1.2 Operation control function by the wired remote control 1.10.2 Operation control function by the wired remote control ●Model RC-EX3A (1) Switching sequence of the operation mode switches of remote control (a) Tap the change operation mode button on the TOP screen. (b) When the change operation mode screen is displayed, tap the button of desired mode.
  • Page 9 '19 • PAC-SM-334 ●Content memorized with the power failure compensation are as follows. Note(1) Items (f) and (g) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled regardless whether the power failure compensation is effective or not. At power failure –...
  • Page 10 '19 • PAC-SM-334 ● Model RC-E5 (1) 　 Switching sequence of the operation mode switches of remote control COOL HEAT AUTO (2) 　 CPU reset This functions when “CHECK” and “ESP” buttons on the remote control are pressed simultaneously. Operation is same as that of the power source reset.
  • Page 11 '19 • PAC-SM-334 1.3 Operation control function by the indoor control (Ⅰ) FDT, FDU, FDUM, FDE series (1) Auto operation (a) If “Auto” mode is selected by the remote control, the heating and the cooling are automatically switched according to the difference between outdoor air temperature and setting temperature and the difference between setting temperature and return air temperature.
  • Page 12 '19 • PAC-SM-334 (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
  • Page 13 '19 • PAC-SM-334 (b) FDU, FDUM, FDE series Return air temperature sensor [Thi-A (by the remote control when the remote control sensor is enabled)] controls the indoor temperature environment simultaneously. (i) Operation is started in the cooling mode. When the difference between the return air temperature and the setting temperature is 2°C or less, the indoor unit fan tap is brought down by one tap.
  • Page 14 '19 • PAC-SM-334 (v) Timer operations which can be set in combination Item Timer OFF timer ON timer Weekly timer Item Timer Í Í OFF timer Í Í ON timer Í Weekly timer Í Í Í Notes (1) : Allowed Í: Not (2) Since the ON timer, sleep timer and OFF timer are set in parallel, when the times to turn ON and OFF the air-conditioner are duplicated, the setting of the OFF timer has priority.
  • Page 15 '19 • PAC-SM-334 (6) Hot keep Hot keep control is performed at the start of the defrost operation. (a) Control (i) When the indoor heat exchanger temperature (detected with Thi-R1 or R2) drops to less than 35°C, the speed of indoor fan follows fan setting at the time of thermostat OFF.
  • Page 16 '19 • PAC-SM-334 (8) Thermostat operation (a) Cooling (i) Thermostat is operated with the room temperature control. (ii) Thermostat is turned ON or OFF relative to the set room temperature as shown below. Thermostat ON Temperature drop Thermostat OFF Temperature rise Set room temperature (iii) Thermostat is turned ON when the room temperature is in the range of -1 <...
  • Page 17 '19 • PAC-SM-334 (d) Fan control during cooling thermostat OFF (i) Following fan controls during the cooling thermostat OFF can be selected with the indoor function setting of the wired remote control. ① Low fanspeed, ② Set fan speed (Factory default), ③ Intermittence, ④ Fan OFF (ii) When the “Low fan speed”...
  • Page 18 '19 • PAC-SM-334 (11) Drain pump control (a) This control is operated when the inverter frequency is other than 0 Hz during the cooling operation and automatic cooling and dehumidifying operations. (b) Drain pump ON condition continues for 5 minutes even when it enters the OFF range according to (i) above after turning the drain pump ON, and then stops.
  • Page 19 '19 • PAC-SM-334 (c) Operation check mode There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the remote control. (d) Drain pump test run mode As the drain pump test run is established, the drain pump only operates and during the operation protective functions by the microcomputer of indoor unit become ineffective.
  • Page 20 '19 • PAC-SM-334 (17) Plural unit control – Control of 16 units group by one remote control (a) Function One remote control can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode” which is set by the remote control can operate or stop all units in the group one after another in the order of unit. No. Thermostat and protective function of each unit function independently.
  • Page 21 '19 • PAC-SM-334 (19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection (a) Broken wire detection When the return air temperature sensor detects -55°C or lower or the heat exchanger temperature sensor detect -55°C or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but, if it is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air temperature sensor: E7, the heat exchanger temperature sensor: E6).
  • Page 22 '19 • PAC-SM-334 (b) Input for external control The external input for the indoor unit can be selected from the following input. Input name Content 1 Run/Stop Refer to [(20) (c) Remote operation input] 2 Premission/Prohibition Refer to [(21) Operation permission/prohibition] 3 Cooling/Heating Refer to [(23) Selection of cooling/heating external input function] 4 Emergency stop...
  • Page 23 '19 • PAC-SM-334 Individual operation (Factory default) All units operation (Local setting) Only the unit Only the unit All units in one All units in one directly connected CnT-6 or directly connected remote control remote control to the remote CnTA to the remote control system can be system can be...
  • Page 24 '19 • PAC-SM-334 (a) In case of CnT ① Operation stop level > CnTA ③ Operation permission/prohibition level Operation Operation Operation Stop Stop Stop Level input Operation permission Operation permission CnTA Operation prohibition Operation permission/ prohibition setting Operation Operation( ) Operation Stop Stop...
  • Page 25 '19 • PAC-SM-334 (22) Temporary stop input In case of temporary stop, operation lamp of remote control lights, but indoor/outdoor unit stop the operation. (a) In case of “level input” setting (Factory default) Input signal to CnT-6 or CnTA is OFF → ON : Temporary stop Input signal to CnT-6 or CnTA is OFF →...
  • Page 26 '19 • PAC-SM-334 (24) Fan control at heating startup (a) Starting conditions At the start of heating operation, if the difference of setting temperature and return air temperature is 5°C or higher after the end of hot start control, this control is performed. (b) Contents of control (i) Sampling is made at each minute and, when the indoor heat exchanger temperature (detected with Thi-R) is 37°C or higher, present number of revolutions of indoor fan speed is increased by 10min...
  • Page 27 '19 • PAC-SM-334 (32) Fan circulator operation (RC-EX3A only) When the fan is used for circulation, the unit is operated as follows depending on the setting with the remote control. (a) If the invalid is selected with the remote control, the fan is operated continuously during the fan operation. (normal fan mode) (b) If the valid is selected with the remote control, the fan is operated or stopped when on the difference of the remote control temperature sensor and the return air temperature sensor becomes bigger than 3°C.
  • Page 28 '19 • PAC-SM-334 (37) Motion sensor control (RC-EX3A and RCN-E2 only) The sensor determines the presence of people and the amount of activity, and the following controls are done by the motion sensor. Following settings are necessary to activate motion sensor control. (a) Infrared (motion) sensor setting: Installation setting of remote control RC-EX3A The indoor unit which is set to “Enable”...
  • Page 29 '19 • PAC-SM-334 (i) Power saving / comfort control The set temperature is adjusted according to the presence of people and their amount of activity detected by the infrared (motion) sensor. MODE:AUTO/COOL/HEAT mode operation Heat Source & Activity High None Normal When the extent of human 33ºC...
  • Page 30 '19 • PAC-SM-334 '09•SRK-DB-087D (Ⅱ) SRK series (1) Unit ON/OFF button wireless wireless (a) Operation (b) Details of operation COOL, DRY HEAT Function Indoor temperature Fan speed Flap/Louver Timer switch setting Operation mode COOL Unit ON/OFF button HEAT (2) Auto restart function Jumper wire (JA1) (ii) (JA1)
  • Page 31 '19 • PAC-SM-334 (4) Selection of the annual cooling function The annual cooling control is valid from factory default setting. It is possible Jumper wire (JA3) to disable by cutting jumper wire (JA3), or changing the setting of DIP switch (SW2-4) on the interface kit (Option) PCB if it is connected.
  • Page 32 ③ When the operation is retrieved from CLEAN or ALLERGEN CLEAR operation. (b) When the following operation are set, ECONOMY operation will be canceled. ① When the HI POWER/ECONO button is pressed again. '19 • PAC-SM-334 ② When the operation mode is changed DRY to FAN. (c) Not operable while the air-conditioner is OFF.
  • Page 33 display Center installation Left Approx. 50° Left Approx. 20° Center Right Approx. 20° Right Approx. 50° '19 • PAC-SM-334 (c) Swing (ii) In HEAT operation In COOL, DRY, FAN operation Approx. 5° Approx. 35° Approx. 60° Approx. 70° (d) Memory ap (Flap or Louver stopped) '09•SRK-DB-087D (e) When not operating (8) 3D auto operation...
  • Page 34 Cooling Heating '19 • PAC-SM-334 Flap Up/down swing Center (Fixed) Louver Cooling Heating Flap Horizontal blowing (Fixed) Slant forwardl blowing (Fixed) Wide (Fixed) Louver Operation mode Air flow direction contorol Indoor temp. – Setting temp. 2°C < = 2°C < Indoor temp. – Setting temp. 5°C <...
  • Page 35 (c) OFF timer operation '19 • PAC-SM-334 (11) Installation location setting wireless (a) Setting If the air-conditioning unit is running, press the ON/OFF button to stop. (ii) Press the AIR FLOW U/D (UP/DOWN) button and the AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds or more.
  • Page 36 4-way valve (3 minutes ON) (b) Details of control at each operation mode (pattern) '19 • PAC-SM-334 Fuzzy operation Model SRK100ZR-W Fan speed 12-120rps AUTO 12-120rps 12-120rps 12-106rps 12-70rps '09•SRK-DB-087D '09•SRK-DB-087D (ii) Hot keep operation fan motor (13) Outline of cooling operation (13) Outline of cooling operation (a) Operation of major functional components in cooling mode (a) Operation of major functional components in cooling mode...
  • Page 37 (15) Outline of automatic operation 12-110rps AUTO 12-110rps (a) Determination of operation mode 12-88rps '19 • PAC-SM-334 12-72rps 12-40rps Cooling 27.5 (15) Outline of automatic operation (a) Determination of operation mode (a) Determination of operation mode 25.5 Operation mode is determined by indoor air temperature and outdoor air temperature as following. Dehumidifying Indoor air temperature (˚C) 18.0...
  • Page 38 '19 • PAC-SM-334 (ii) Contents of operation Air capacity control Model SRK100ZR-W Item Follow the table below Range A Upper limit of compressor’s command speed 56rps Range B Note (1) Ranges A and B are as shown below. ● Condition for Range A Compressor’s command speed is controlled according to the indoor Range B...
  • Page 39 '19 • PAC-SM-334 Indoor fan motor protection Serial signal transmission error protection Purpose (ii) Detail of operation Rotor lock Outdoor fan motor protection Outdoor fan control at low outdoor temperature Cooling Operating conditions Detail of operation Outdoor fan Outdoor temperature > 10(0)˚C Outdoor temperature <...
  • Page 40 '19 • PAC-SM-334 1.4 Operation control function by the outdoor control (1) Compressor speed Unit: rps Model Cooling Heating Item FDC90 FDC100 FDC90 FDC100 Upper limit 120 (68) 120 (74) 120 (70) 120 (70) Lower limit Note (1) Valuc in ( ) are for the silent mode. Compressor protection start (a) Compressor protection start I (i) Operating condition...
  • Page 41 '19 • PAC-SM-334 (c) Relationship between compressor speed and outdoor fan speed. Outdoor fan speed is controlled according to the operation mode (Heating/cooling) and the compressor speed. Unit: rps Fan speed 1st speed 2nd speed 3rd speed 4th speed 5th speed 6th speed 7th speed 8th speed...
  • Page 42 '19 • PAC-SM-334 (ii) Heating Operating conditions When the outdoor air temperature (TH2) is 13ºC or higher continues for 30 seconds while the compressor speed is other than 0 rps. Detail of operation After the outdoor fan operates at -3 speed for 60 seconds; the corresponding outdoor heat exchanger temperature shall im- plement the following controls.
  • Page 43 '19 • PAC-SM-334 (b) Ending conditions (Operation returns to the heating cycle when either one of the following is satisfied.) Outdoor heat exchanger sensor (TH1) temperature: 10ºC or higher. (ii) Continued operation time of defrost operation → For more than 15 minutes. •...
  • Page 44 lower limit After lapse of 20 sec. or over speed 30 rps 0rps '19 • PAC-SM-334 Outdoor heat exchanger temperature (°C) (7) Cooling low outdoor temperature protective control (a) Operating conditions When the outdoor air temperature (TH2) is CºC or lower continues for 20 seconds while the compressor speed is other than 0 rps.
  • Page 45 '19 • PAC-SM-334 (9) Heating overload protective control (a) Operating conditions When the outdoor air temperature (TH2) is 13°C or higher continues for 30 seconds than 0 rps.while the compressor speed is other than 0 rps. (b) Detail of operation 90(75)rps calculation exceeds the upper limit, the upper limit value is maintained.
  • Page 46 '19 • PAC-SM-334 (ii) If the temperature of 115ºC is detected by the sensor on the discharge pipe, then the compressor will stop im- mediately.When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour but there is no start at the third time.
  • Page 47 '19 • PAC-SM-334 (18) Silent mode As “Silent mode start” signal is received from the remote control, it operates by dropping the outdoor fan tap. Item Outdoor fan tap (Upper limit) Model FDC90, 100VNP-W Cooling: 7th speed, Heating: 7th speed (19) Broken wire detection on temperature sensor Outdoor unit heat exchanger temperature sersor, outdoor air temperature sensor.
  • Page 48 '19 • PAC-SM-334 2. MAINTENANCE DATA 2.1 FDT, FDU, FDUM, FDE series 2.1.1 Diagnosing of microcomputer circuit (1) Selfdiagnosis function (a) Check indicator table Whether a failure exists or not on the indoor unit can be know by the contents of remote control error code, indoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
  • Page 49 '19 • PAC-SM-334 Remote control Indoor unit control PCB Reference Location of trouble Description of trouble Repair method Green page Error code Red LED Red LED LED (1) Fan motor • Defective by rotation speed of fan motor Replacement, repair 1(2)-time Keeps flash...
  • Page 50 '19 • PAC-SM-334 (iv) Display sequence of error codes or inspection indicator lamps ■ Occurrence of one kind of error Displays are shown respectively according to errors. ■ Occurrence of plural kinds of error Section Category of display Error code on remote •...
  • Page 51 '19 • PAC-SM-334 ■ Error log and reset Error indicator Memorized error log Reset Remote control display • Higher priority error is memorized. • Stop the unit by pressing the ON/OFF switch of remote control. Red LED on indoor unit control PCB • Not memorized. •...
  • Page 52 '19 • PAC-SM-334 1) Model FDT series a) Replace the control PCB i) Unscrew terminal (Arrow A) of the "E1" wiring (yellow/green) that is connected to PCB. ii) Replace the PCB only after all the wirings connected to the connector are removed. iii) Fix the board such that it will not pinch any of the wires.
  • Page 53 '19 • PAC-SM-334 2) Models FDU, FDUM, FDE series PSB012D990 a) Control PCB PSB012D990B Replace and set up the PCB according to this instruction. i) Set to an appropriate address and function using switch on PCB. 　 Select the same setting with the removed PCB. item switch Content of control...
  • Page 54 '19 • PAC-SM-334 b) Power PCB This PCB is a general PCB. Replace the PCB according to this instruction. This PCB is a general PCB. Replace the PCB according to this instruction. i) Replace the PCB i)Replace the PCB ① Unscrew terminal of the wiring(yellow/green) connected to Terminal block (CNWO) from the box. �...
  • Page 55 ③ Fix the board such that it will not pinch any of the wires. ④ Reconnect the wirings to the PCB. Wiring connector color should match with the color of connector of the PCB. ⑤ Screw back the terminal of wiring, that was removed in ①. '19 •...
  • Page 56 '19 • PAC-SM-334 ●DIP switch setting list Switch Description Default setting Remark Address No. setting at plural indoor units control by 1 R/C Reserved keep OFF SW5-1 Reserved keep OFF SW5-2 SW6-1 SW6-2 Model selection As per model See table 1. SW6-3 SW6-4 Normal * /Test run...
  • Page 57 '19 • PAC-SM-334 Troubleshooting at the outdoor unit When troubleshooting the outdoor unit, firstly assess the overview of malfunction and try to presume the cause and the faulty part by checking the error code dispalyed on the remote control, and then proceed further inspection and remedy Self-diagnosis system by microcomputor on indoor unit and outdoor unit PCB can assist to find the cause of malfunction smoothly by making a diagnosis of not only the anomaly of microcomputer, but also the anomaly in power source system, installation space, overload resulting from improper charging amount of refrigerant and etc.
  • Page 58 '19 • PAC-SM-334 Model FDC90, 100VNP-W 1)Shut down a power source. 2)Remove a top panel.(Fig.1　①） 3)Detach a service panel.（Fig.1　②） 4)Detach a top panel of control box. ① ② Fig.1 Outdoor unit 5)Make sure that 3 minutes are elasped after shutting down a power source. 6)Check a voltage with the temrinal of C58 by multimeter.
  • Page 59 '19 • PAC-SM-334 9)Disconect the cable of terminal block and fuse.(Fig.4　⑦、⑧） 10)Disconnect the cables of reactor.（Fig.4　⑨） ⑦ ⑧ ⑨ Fig.4 Cable of fuse, terminal block and reactor 11)Disconnect 2 earth calbes on right side of control box.（Fig.5　⑩、⑪） ⑩ ⑪ Fig.5 Earth cable of control box 12)Disconnect CnTH(Black) on control PCB.
  • Page 60 '19 • PAC-SM-334 15)Make sure setting of jumper on new PCB is the same with old PCB's setting. (Fig.8) Fig.8 Setting of jumper on PCB 16)Connect the cables and connectors with the control PCB. (Confirm the connectors are not half inserted.)
  • Page 61 '19 • PAC-SM-334 Check of anomalous operation data with the remote control (a) In case of RC-EX3A remote control [Operating procedure] ➀ On the TOP screen, touch the buttons in the order of “Menu” ➝ “Service setting” ➝ “Service & Maintenance” ➝ “Service password”...
  • Page 62 '19 • PAC-SM-334 (b) In case of RC-E5 remote control Number Data Item Operation data can be checked with remote control unit (Operation Mode) (Set Temperature) operation. (Return Air Temperature) ➀ Press the button. (Remote Control Temperature Sensor Tempeature) The display change “ ”...
  • Page 63 '19 • PAC-SM-334 Power transistor module (Including the driver PCB) inspection procedure Is the power transistor module cracked or burnt? Is there a short circuit between the power transistor module ∗ terminals? Compressor operation Is there any difference in the compressor current If there is a 10% or greater difference between phases? in the current in different phases.
  • Page 64 '19 • PAC-SM-334 Inverter checker for diagnosis of inverter output (c) Models FDC71, 90VNP ● Checking method (i) Setup procedure of checker. 1) Power OFF (Turn off the breaker). 2) Remove the terminal cover of compressor and disconnect the wires (U, V, W) from compressor. 3) Connect the wires U (Red) , V (White) and W (Black) of checker to the terminal of disconnected wires (U, V, W) from compressor respectively.
  • Page 65 '19 • PAC-SM-334 Outdoor unit control failure diagnosis circuit diagram Model FDC90, 100VNP-W...
  • Page 66 '19 • PAC-SM-334 2.1.2 Troubleshooting flow (1) List of troubles Model FDC90, 100VNP-W Remote control display Description of trouble Reference page None Operates but does not cool. None Operates but does not heat. None Earth leakage breaker activated None Excessive noise/vibration (1/3) None Excessive noise/vibration (2/3) None...
  • Page 67 '19 • PAC-SM-334 (2) Troubleshooting Green Content Error code None Operates but does not cool Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor unit fan operation. Check the temperature differnce between return and supply air.
  • Page 68 '19 • PAC-SM-334 Green Content Error code Operates but does not heat None Remote control: Keeps flashing Stays OFF Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor unit fan operation. Check the temperature differnce between return and supply air. It is normal.
  • Page 69 '19 • PAC-SM-334 Green Content Error code Earth leakage breaker activated None Remote control: Stays OFF Stays OFF Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are OK the insulation resistance and Replace compressor. coil resistance of compressor? 2.
  • Page 70 '19 • PAC-SM-334 Green Content Error code Excessive noise/vibration (1/3) None Remote control: – – Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure If excessive noise/vibration persists when sufficient Does time has elapsed after noise/vibration stopping the unit, it is occur during or soon considered that the air- after stopping operation...
  • Page 71 '19 • PAC-SM-334 Green Content Error code Excessive noise/vibration (2/3) None Remote control: – – Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting the casing.
  • Page 72 '19 • PAC-SM-334 Green Content Error code Excessive noise/vibration (3/3) None Remote control: – – Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page If insufficient cooling/ heating problem happens Adjustment during commissioning due to anomalous operating Does noise/vibration occur when the conditions at cooling/ cooling/heating operation is in...
  • Page 73 '19 • PAC-SM-334 Green Content Error code Louver motor failure None Remote control: Keeps flashing Stays OFF Indoor (FDT, FDE series) 5. Troubleshooting 1. Applicable model FDT, FDE series only Diagnosis Countermeasure Check at the indoor unit side. Operate after waiting for more than 1 minute.
  • Page 74 '19 • PAC-SM-334 Green Error code Content Power source system error None Remote control: (Power source to indoor unit control PCB) Indoor Stays OFF Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure AC220-240V detected between on the terminal block of indoor unit? AC220-240V...
  • Page 75 '19 • PAC-SM-334 Green Content Power source system error Error code None (Power source to remote control) Remote control: Keeps flashing Stays OFF Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Isn't there any Correct. loose connection of remote control wires? 2.
  • Page 76 '19 • PAC-SM-334 Green Content Error code INSPECT I/U INSPECT I/U Remote control: Keeps flashing Stays OFF Indoor (When 1 or 2 remote controls are connected) 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are 2 units of remote control connected? ⑴，...
  • Page 77 '19 • PAC-SM-334 Green Content Error code INSPECT I/U INSPECT I/U Remote control: Keeps flashing Stays OFF Indoor (Connection of 3 units or more remote controls) 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are more than Reduce to 2 units or less. 3 units of remote control connected? Does remote...
  • Page 78 '19 • PAC-SM-334 Green Error code Content Communication error at Remote control: WAIT initial operation (1/3) Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure When the remote control LCD displays “ ” 2 WAIT minutes after the power on.
  • Page 79 '19 • PAC-SM-334 Green Error code Content Communication error at Remote control: WAIT initial operation (2/3) Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure When the fuse is blown, the method to inspect outdoor unit PCB before replacing the power From previous page source fuse...
  • Page 80 '19 • PAC-SM-334 Green Error code Content Communication error at Remote control: WAIT initial operation (3/3) Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure When the remote control display is extinguished after the Remote control display is power on.
  • Page 81 '19 • PAC-SM-334 Green Content Error code Remote control Remote control: Keeps flashing Stays OFF Indoor communication circuit error 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is it possible to Malfunction by noise reset normally by the Check peripheral power reset? environment.
  • Page 82 '19 • PAC-SM-334 Green Content Error code Communication error during operation Remote control: Keeps flashing 2-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Note (1) Inspect faulty connections (disconnection, looseness) on the outdoor unit terminal block. Is the connection of signal Repair signal wires.

  • Page 83: Applicable Model

    '19 • PAC-SM-334 Green Content Error code Indoor heat exchanger Remote control: temperature sensor anomaly Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of indoor heat Correct. ➞ Insert connector exchanger temperature sensor securely.
  • Page 84 '19 • PAC-SM-334 Green Content Error code Return air temperature Remote control: sensor anomaly Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of return Correct. ➞ Connect air temperature sensor connector. connector OK? 2.
  • Page 85 '19 • PAC-SM-334 Green Content Error code Heating overload operation Remote control: Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the air filter clogged? Wash. 2. Error detection method Is the indoor heat exchanger Defective indoor heat temperature sensor exchanger temperature...
  • Page 86 '19 • PAC-SM-334 Green Content Error code Drain trouble Remote control: (FDT, FDU, FDUM series) Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model FDT, FDU, FDUM series only Diagnosis Countermeasure Check the error data in the remote control. Is there any overflow? Is DC 12V at CNI connector.
  • Page 87 '19 • PAC-SM-334 Excessive number of connected Green Content Error code indoor units (more than 17 units) Remote control: Keeps flashing Stays OFF Indoor by controlling with one remoto control 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Aren't more than 17 Defective remote control indoor units connected to one ➞...
  • Page 88 '19 • PAC-SM-334 Green Content Error code Address setting error of Remote control: indoor units Keeps flashing Keeps flashing Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E11 occurs Is “Master IU address set” function of remote 2. Error detection method control used? IU address has been set using the “Master IU address set”...
  • Page 89 '19 • PAC-SM-334 Green Content Error code Communication error Remote control: between master and slave indoor units Keeps flashing 3-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is it OK the unit Correct unit address setting. address setting for master and slave indoor units?
  • Page 90 '19 • PAC-SM-334 Green Content Error code Indoor fan motor anomaly Remote control: Keeps flashing 1(2)-time flash Indoor Note(1) Value in ( ) is for the FDU, FDUM series FMi2 only. 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign material Remove foreign material.
  • Page 91 '19 • PAC-SM-334 Green Content Error code Address setting error of Remote control: master and slave indoor units Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E18 occurs Is “Master IU address set” function of remote 2.
  • Page 92 '19 • PAC-SM-334 Green Content Error code Indoor unit operation check, Remote control: Keeps flashing 1-time flash drain pump motor check setting error Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E19 occurs when the power ON Is SW7-1 Defective indoor unit on the indoor unit control control PCB (Defective...
  • Page 93 '19 • PAC-SM-334 Green Content Error code Indoor fan motor rotation Remote control: Keeps flashing 1(2)-time flash speed anomaly Indoor Note(1) Value in ( ) is for the FDU, FDUM series FMi2 only. 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any...

  • Page 94: When The Temperature Sensor

    '19 • PAC-SM-334 Green Content Error code Remote control Remote control: temperature sensor anomaly Keeps flashing Stays OFF Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the remote Correct. control temperature sensor connected properly? 2. Error detection method Are the Is the remote characteristics of...
  • Page 95 '19 • PAC-SM-334 Green Error code Content Cooling overload operation Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * For the characteristics of outdoor heat exchanger temperature Are normal sensor, refer to E37. the characteristics of Replace outdoor heat outdoor heat exchanger...
  • Page 96 '19 • PAC-SM-334 Green Error code Content Discharge pipe temperature error Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * For the characteristics of discharge Are the pipe temperature, refer to E39. characteristics of discharge pipe temperature Replace discharge pipe...

  • Page 97: Seconds Continuously Within 2 Minutes To 2 Minutes

    '19 • PAC-SM-334 Green Error code Content Outdoor heat exchanger Remote control: temperature sensor anomaly Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the outdoor heat exchanger temperature Correct connector. sensor connector connected properly? 2.

  • Page 98: Table Of Contents

    '19 • PAC-SM-334 Green Error code Content Outdoor air temperature Remote control: sensor anomaly Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure the outdoor air Correct connector. temperature sensor connector connected properly? For the characteristics of outdoor air temperature sensor, see the following graph.

  • Page 99: Presumable Cause

    '19 • PAC-SM-334 Green Error code Content Discharge pipe Remote control: temperature sensor anomaly Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the discharge pipe temperature sensor Correct connector. connector connected properly? 2. Error detection method For the characteristics of discharge pipe Are the temperature sensor, see the following graph.
  • Page 100 '19 • PAC-SM-334 Green Error code Content Service valve (gas side) closing operation Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are the Open the service valve. service valve (gas side) opened? 2.
  • Page 101 '19 • PAC-SM-334 Green Error code Content Remote control: Current cut (1/2) Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure All models Is the power source Check power source. voltage OK? 2. Error detection method Are the Open the service valves.
  • Page 102 '19 • PAC-SM-334 Green Error code Content Current cut (2/2) Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page Is the checked result of power Defective outdoor unit transistor module PCB➞Replace.
  • Page 103 '19 • PAC-SM-334 Green Error code Content Active filter voltage error Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Restore normal condition. Is the power source normal? 2. Error detection method Is voltage Restore normal condition.
  • Page 104 '19 • PAC-SM-334 Green Error code Content Outdoor fan motor anomaly Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign material intervene Remove foreign matter. in rotational area of fan propeller? Does the 2.
  • Page 105 '19 • PAC-SM-334 Green Green Error code Error code Content Content Power transistor anomaly Remote controller: E51 Remote control: Power transistor error Keeps flashing Stays Off Indoor Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check soldered surfaces on the outdoor unit PCB for...

  • Page 106: Applicable Model

    '19 • PAC-SM-334 Green Error code Content Insufficient refrigerant amount Remote control: or detection of service valve closure Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the Open fully. service valve fully opened? Are the connections of indoor heat exchanger and/or return air...
  • Page 107 '19 • PAC-SM-334 Green Green Content Error code Error code Content Current safe stop Keeps flashing Stays Off Indoor Current safe stop Remote controller: E58 Remote control: Indoor Keeps flashing Stays OFF (Model SRC40 - 60) 3 time flash Outdoor ―...
  • Page 108 '19 • PAC-SM-334 Green Error code Content Compressor startup failure Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Disconnect the outdoor fan motor Compressor does not start at all. connector and try to startup Neither noise nor vibration cannot be heard Does Replace outdoor fan motor.
  • Page 109 '19 • PAC-SM-334 Green Error code Content Compressor rotor lock error Remote control: Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the power source voltage Check and correct the power source voltage. Reset the power source and restart operation. 2.

  • Page 110: Yes

    '09•SRK-DB-087D '19 • PAC-SM-334 Reference Reference 2.2 SRK series This chapter has described about an indoor unit. Look at 2.1 chapters about the outdoor unit. 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (2) Items to check before troubleshooting source (3) Troubleshooting procedure (If the air-conditioner does not run at all) satisfied Important...
  • Page 111 '09•SRK-DB-087D '19 • PAC-SM-334 (4) Troubleshooting procedure (If the air-conditioner runs) See page 111. See pages 112 - 118. See pages 112 - 118.

  • Page 112: Power Transistor Anomaly Power Transistor Error

    '09•SRK-DB-087D '19 • PAC-SM-334 (5) Self-diagnosis table Wired Indoor unit display panel remote Description Cause Display (flashing) condition control TIMER of trouble display light light When a heat exchanger sensor 1 wire disconnection is detected while • Broken heat exchanger sensor 1-time Heat exchanger 1 wire, poor connector...
  • Page 113 '19 • PAC-SM-334 (6) Service mode (Trouble mode access function) (a) Explanation of terms Explanation Term The service mode is the mode where service data are displayed by flashing of the display Service mode lights when the operations in item (b) below are performed with the indoor control. These are the contents of error displays and protective stops which occurred in the past in the air-conditioner system.
  • Page 114 '19 • PAC-SM-334 4-time flash 2-time flash. wireless mode mode Self-diagnosis data wireless mode mode Wireless remote control setting Contents of output data Operation mode Fan speed mode wireless Indicates the number of Wireless remote control setting occasions previous to the present Temperature setting the error display data are from.
  • Page 115 '09•SRK-DB-087D '19 • PAC-SM-334 (Example) Wireless remote control setting Operation Displayed data Fan speed Temperature mode mode setting Displays the reason for the stop (error code) the previous time an error was displayed. 21ºC Displays the reason for the stop (error code) 2 times previous when an error was displayed. 22ºC Cooling 23ºC...
  • Page 116 '19 • PAC-SM-334 (c) Error code, stop code table Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light light Error coad (10's digit) (1's digit) Normal The wired remote control wire Y is open. The wired remote control wires X and Y are reversely connected.
  • Page 117 '09•SRK-DB-087D '19 • PAC-SM-334 4-time flash 2-time flash. (d) Operation mode, Fan speed mode information tables (i) Operation mode (ii) Fan speed mode Display pattern when Display pattern when Fan speed in service mode in service mode Operation mode mode when when there is an there is an RUN light...

  • Page 118: Yes

    '09•SRK-DB-087D '19 • PAC-SM-334 (e) Temperatare information Room temperature sensor, indoor heat exchanger temperature sensor, outdoor air temperature sensor, outdoor heat exchanger temperature sensor temperature Unit: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal...
  • Page 119 '09•SRK-DB-087D '19 • PAC-SM-334 (ii) Discharge pipe sensor temperature Unit: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal -64ºC data 0.1 sec.
  • Page 120 '09•SRK-DB-087D '19 • PAC-SM-334 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless 114)
  • Page 121 '09•SRK-DB-087D '19 • PAC-SM-334 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room temperature, indoor heat exchanger temperature) (Short-circuit) - 10 Temperature (˚C) Indoor fan motor error Defective fan motor, connector poor connection, defective indoor unit PCB the fan motor and indoor unit PCB separately.
  • Page 122 '09•SRK-DB-087D '19 • PAC-SM-334 Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB source ② ③ Defective outdoor unit PCB ② ③ Defective outdoor unit PCB. Check crossover wires. ① ② Defective indoor unit PCB...

  • Page 123: Replace Fuse

    '19 • PAC-SM-334 (8) Phenomenon observed after short-circuit, wire breakage on sensor Phenomenon Operation Sensor mode Shortcircuit Disconnected wire Cooling Room temperature sensor Heating Cooling Freezing cycle system protection trips and stops the compressor. Heat exchanger temperature sensor Heating Cooling Humidity sensor Heating '09•SRK-DB-087D...
  • Page 124 blocks ② and ③ oscillating between PCB. DC 0 and 20V? '19 • PAC-SM-334 Indoor electrical components are normal. (b) Indoor fan motor check procedure This is a diagnostic procedure for determining if the indoor fan motor or the indoor unit PCB is broken down. (i) Indoor unit PCB output check in the following figure are output for approximately 30 seconds, it means that the indoor unit PCB is normal and the fan motor is broken down...
  • Page 125 Operation SW ON Measure in this section '19 • PAC-SM-334 (10) How to make sure of wireless remote control wireless wireless wireless wireless wireless wireless Simplified check methd of wireless remote control   It is normal if the signal transmission section of the wireless remote control emits a whitish light at each transmission on the monitor of digital camera.
  • Page 126 '19 • PAC-SM-334 3. ELECTRICAL WIRING (1) Indoor units (a) Ceiling cassette-4 way type (FDT) Model FDT100VH PJF000Z554...
  • Page 127 '19 • PAC-SM-334 (b) Duct connected-High static pressure type (FDU) Model FDU100VH PJG000Z580...
  • Page 128 '19 • PAC-SM-334 (c) Duct connected-Low / Middle static pressure type (FDUM) Model FDUM100VH PJG000Z490...
  • Page 129 '19 • PAC-SM-334 (d) Ceiling suspended type (FDE) Model FDE100VH PFA004Z087...
  • Page 130 '19 • PAC-SM-334 (e) Wall mounted type (SRK) Model SRK100ZR-W RWA000Z417...
  • Page 131 '19 • PAC-SM-334 (2) Outdoor units Models FDC90VNP-W, 100VNP-W PCA001Z876...
  • Page 132 Capillary tube (Thi-R1) Electronic (Flaare connecting) expansion valve Temperature sensor (Heat Liquid pipe (EEV) exchanger) (φ6.35) Capillary tube (Thi-R2) '19 • PAC-SM-334 Strainer Strainer Reducer (Accessory) 4. PIPING SYSTEM Indoor unit Outdoor unit Heating cycle Model 90, 100 Model 90, 100 Cooling cycle Service valve Outdoor air...
  • Page 133 Capillary tube (Thi-R1) Electronic (Flaare connecting) expansion valve Temperature sensor (Heat Liquid pipe (EEV) exchanger) (φ6.35) Capillary tube (Thi-R2) '19 • PAC-SM-334 Strainer Strainer Reducer (Accessory) Indoor unit Outdoor unit Heating cycle Model 90, 100 Cooling cycle Service valve Outdoor air (2) SRK series temperature sensor Gas pipe...
  • Page 134 Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. © Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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