Mitsubishi Heavy Industries FDT71VNPVG Service Manual
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Mitsubishi Heavy Industries FDT71VNPVG Service Manual

Mitsubishi Heavy Industries FDT71VNPVG 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
FDT71VNPVG
FDT90VNP1VG
DUCT CONNECTED-LOW/MIDDLE
STATIC PRESSURE TYPE
FDUM71VNPVF1
FDUM90VNP1VF2
FLOOR STANDING TYPE
FDF71VNPVD1
FDF90VNP1VD2
Note:
•
(1) Outdoor unit in this service manual will have the service code "/M".
• FDC71VNP → FDC71VNP/M
• FDC90VNP1 → FDC90VNP1/M
Manual No. '18 • PAC-SM-285
updated September 28, 2018
DUCT CONNECTED-HIGH STATIC
PRESSURE TYPE
FDU71VNPVF1
FDU90VNP1VF2
CEILING SUSPENDED TYPE
FDE71VNPVG
FDE90VNP1VG

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Summary of Contents for Mitsubishi Heavy Industries FDT71VNPVG

  • Page 1 Manual No. ‘18 • PAC-SM-285 updated September 28, 2018 SERVICE MANUAL STANDARD INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type) CEILINING CASSETTE-4 WAY TYPE DUCT CONNECTED-HIGH STATIC FDT71VNPVG PRESSURE TYPE FDT90VNP1VG FDU71VNPVF1 FDU90VNP1VF2 DUCT CONNECTED-LOW/MIDDLE CEILING SUSPENDED TYPE FDE71VNPVG...

  • Page 2: Table Of Contents

    '18 • PAC-SM-285 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ....... 3 1.1 Remote control ....................3 1.2 Operation control function by the wired remote control ......7 1.3 Operation control function by the indoo r control ........10 1.4 Operation control function by the outdoor control .........
  • Page 3 '18 • PAC-SM-285 3. ELECTRICAL WIRING ..................102 (1) Indoor units ..................... 102 (2) Outdoor units ....................109 ....................111 4. PIPING SYSTEM...

  • Page 4: Outline Of Operation Control By Microcomputer

    '18 • PAC-SM-285 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 Remote control (1) Wired remote control Model RC-EX3 ⑤ LCD (With backlight) ③ F2 switch ④ Operation ⑥ USB port (mini-B) ① Run/Stop switch ② F1 switch Touch panel system, which is operated by tapping the LCD screen with a finger, is employed for any operations other than the ①Run/Stop, ②F1 and ③F2 switches.
  • Page 5 '18 • PAC-SM-285 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 '18 • PAC-SM-285 Wireless remote control (2) Wireless remote control RCN-E2 (Except FDF series) 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. ②...

  • Page 7: Operation Section

    '18 • PAC-SM-285 RCN-E1R (FDF series only) Indication section Indicates set temperature. Indicates the status of swing louver. Indicates selected operation with Indicates the selected air flow volume. Indicates for two seconds when FILTER button is pressed. Indicates when ON-TIMER is set. Indicates when OFF-TIMER is set.

  • Page 8: Operation Control Function By The Wired Remote Control

    '18 • PAC-SM-285 1.2 Operation control function by the wired remote control 1.2 Operation control function by the wired remote control Model RC-EX3 (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: Alert Displays

    '18 • PAC-SM-285 ●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 '18 • PAC-SM-285 Model RC-E5 Switching sequence of the operation mode switches of remote control COOL HEAT AUTO 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. Power failure compensation function (Electric power source failure) •...

  • Page 11: Operation Control Function By The Indoor Control

    '18 • PAC-SM-285 1.3 Operation control function by the indoor control (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: Dehumidifying (Dry) Operation

    '16 • PAC-T-251 '18 • PAC-SM-285 (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 based Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".

  • Page 13: Timer Operation

    '18 • PAC-SM-285 (b) Except FDT series Return air temperature thermistor [Thi-A (by the remote control when the remote control thermistor is enabled)] controls the indoor temperature environment simultaneously. 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 '18 • PAC-SM-285 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 timerand OFF timer are set in parallel, when the times to turn ON and OFF the airconditioner are duplicated, the setting of the OFF timer has priority.
  • Page 15 '18 • PAC-SM-285 (6) Hot keep Hot keep control is performed at the start of the defrost operation. 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. (ii) During the hot keep, the louver is kept at the horizontal position.

  • Page 16: Thermostat Operation

    '18 • PAC-SM-285 (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: Filter Sign Setting

    '18 • PAC-SM-285 (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: Drain Pump Control

    '18 • PAC-SM-285 (11) Drain pump control 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: Cooling, Dehumidifying Frost Protection

    '18 • PAC-SM-285 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: Anomalous Fan Motor

    '18 • PAC-SM-285 (16) Anomalous fan motor After starting the fan motor, if the fan motor speed is 200 min or less is detected for 30 seconds continuously and 4 times within 60 minutes, then fan motor stops with the anomalous stop (E16). (b) If the fan motor fails to reach at -50 min (FDU:-500min ) less than the required speed, it stops with the anomalous...
  • Page 21 '18 • PAC-SM-285 Notes (1) Factory default is STANDARD. (2) At the hot-start and heating thermostat OFF, or other, the indoor unit fan is operated at the low speed tap of each setting. (3) This function is not able to be set with wireless remote controls or simple remote control (RCH-E3) (19) Abnormal temperature thermistor (return air/indoor heat exchanger) broken wire/short-circuit detection Broken wire detection When the return air temperature thermistor detects -55°C or lower or the heat exchanger temperature thermistor...
  • Page 22 '18 • PAC-SM-285 (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 '18 • PAC-SM-285 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 '18 • PAC-SM-285 (a) In case of CnT ③ Operation stop level > CnTA ① Operation permission/prohibition level Operation Operation Operation Stop Stop Stop Level input Operation permission CnTA Operation prohibition Operation permission/ prohibition setting Operation Operation( ) Operation Stop Stop Stop Actual operation...

  • Page 25: Selection Of Cooling/Heating External Input Function

    '18 • PAC-SM-285 (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 → ON : Normal operation CnT-6 or CnTA input Actual operation Temporary stop Temporary stop Remote control...
  • Page 26 '18 • PAC-SM-285 (24) Fan control at heating startup 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 unit heat exchanger temperature (detected with Thi-R) is 37°C or higher, present number of revolutions of indoor unit fan speed is increased by 10 min...
  • Page 27 '18 • PAC-SM-285 (31) Auto temp. setting (RC-EX3 only) Setting temperature is adjusted automatically at the adequate temperature the center setting temperature. is 24°C by correcting the outdoor air temperature. (32) Fan circulator operation (RC-EX3 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.
  • Page 28 '18 • PAC-SM-285 (37) Motion sensor control (RC-EX3 only)(Except FDF series) 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 The indoor unit which is set to “Enable”...

  • Page 29: Operation Control Function By The Outdoor Control

    '18 • PAC-SM-285 1.4 Operation control function by the outdoor control (1) Compressor speed Unit: rps Cooling Heating Model Item FDC71 FDC90 FDC71 FDC90 Upper limit 120 (80) 120 (74) 120 (90) 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 30 '18 • PAC-SM-285 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 31: Reset Conditions

    '18 • PAC-SM-285 (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 implement the following controls.

  • Page 32: Cooling Overload Protective Control

    '18 • PAC-SM-285 (b) Ending conditions (Operation returns to the heating cycle when either one of the following is satisfied.) Outdoor heat exchanger sensor (TH1) temperature: 20ºC or higher. (ii) Continued operation time of defrost operation → For more than 18 minutes. ¡Defrost operation Heating operation Max. 18 minutes 2-7 minutes Hot start operation Depends on an operation condition, the time can be longer than 7 minutes.

  • Page 33: Heating High Pressure Control

    '18 • PAC-SM-285 (b) Detail of operation The lower limit of the compressor speed is set to 45 (35) rps and even if the speed becomes lower than 45 (35) rps, the speed is kept to 45 (35) rps. However, when the thermostat OFF, the speed is reduced to 0 rps. (ii) The upper limit of the compressor speed is set to 60 <75>...

  • Page 34: Heating Low Outdoor Temperature Protective Control

    '18 • PAC-SM-285 Reset conditions Upper limit 75rps Lower limit 40rps Upper limit 90rps Lower limit 30rps Outdoor air temperature(°C) Heating low outdoor temperature protective control (10)   Operating conditions   lower Detail of operation       Lower limit 45 rps Lower limit 35 rps Normal operation Outdoor air temperature(°C)

  • Page 35: Current Safe

    '18 • PAC-SM-285 (12) Current safe (a) Purpose Current is controlled not to exceed the upper limit of the setting operation current. (b) Detail of operation (i) Input current to the converter is monitored with the current sensor fixed on the printed circuit board of the outdoor unit and, if the operation current value reaches the limiting current value, the compressor speed is reduced. (ii) If the mechanism is actuated when the compressor speed is less than 30 rps, the compressor is stopped immediately.

  • Page 36: Broken Wire Detection On Temperature Sensor

    '18 • PAC-SM-285 (19) Broken wire detection on temperature sensor Outdoor unit heat exchanger sersor, outdoor air temperature sensor. If the following is detected for 5 seconds continuously within 2 minutes to 2 minutes and 20 seconds after the compressor ON, the compressor stops. After a delay of 3 minutes, it restarts but, if the same is detected repeatedly 3 times within 40 minutes, the compressor stops with the anomalous stop.

  • Page 37: Maintenance Data

    '18 • PAC-SM-285 2. MAINTENANCE DATA 2.1 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 38 '18 • PAC-SM-285 Remote control Indoor 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 flashing...
  • Page 39 '18 • PAC-SM-285 (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 40: Troubleshooting Procedure

    '18 • PAC-SM-285 ■ 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 control PCB •...
  • Page 41 '18 • PAC-SM-285 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 42 '18 • PAC-SM-285 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 43: Power Pcb

    '18 • PAC-SM-285 b) Power PCB This PCB is a general PCB. Replace the PCB according to this instruction. i) Replace the PCB ① Unscrew terminal of the wiring(yellow/green) connected to Terminal block (CNWO) from the box. ② Replace the PCB only after all the wirings connected to the connector are removed. ③...

  • Page 44: Terminal Block

    i)Replace the PCB � Unscrew terminal(Arrow A) of the "E2" wiring(yellow/green) that is connected to PCB. � Replace the PCB only after all the wirings connected to the connector are removed. '18 • PAC-SM-285 � Fix the board such that it will not p inch any of the wires. �...
  • Page 45 '18 • PAC-SM-285 4) Model FDF series PSB012D976D a) Control PCB 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 46 '18 • PAC-SM-285 b) Power PCB PSB012D953G This PCB is a general PCB. Replace the PCB according to this instruction. Replace the PCB i) Unscrew terminal of the wining (yellow/green) soldered to PCB from the box. 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 47 '18 • PAC-SM-285 ●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 SW5-2 Reserved keep OFF SW6-1 SW6-2 Model selection As per model See table 1. SW6-3 SW6-4 Normal * /Test run...

  • Page 48: Troubleshooting At The Outdoor Unit

    '18 • PAC-SM-285 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 and outdoor 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 supply system, installation space, overload resulting from improper charging amount of refrigerant and etc.
  • Page 49 '18 • PAC-SM-285 Models FDC71VNP, 90VNP1 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.（Fig.1　③） ③ 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 50 '18 • PAC-SM-285 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 51 '18 • PAC-SM-285 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 52: Check Of Anomalous Operation Data With The Remote Control

    '18 • PAC-SM-285 Check of anomalous operation data with the remote control (a) In case of RC-EX3 remote control [Operating procedure] ➀ On the TOP screen, touch the buttons in the order of “Menu” ➝ “Service setting” ➝ “Service & Maintenance” ➝ “Service password”...
  • Page 53 '18 • PAC-SM-285 (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 Thermistor Tempeature) The display change “ ”...

  • Page 54: Power Transistor Module (Including The Driver Pcb) Inspection Procedure

    '18 • PAC-SM-285 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 55: Inverter Checker For Diagnosis Of Inverter Output

    '18 • PAC-SM-285 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 56: Outdoor Unit Control Failure Diagnosis Circuit Diagram

    '18 • PAC-SM-285 Outdoor unit control failure diagnosis circuit diagram...
  • Page 57 '18 • PAC-SM-285...

  • Page 58: Troubleshooting Flow

    '18 • PAC-SM-285 2.2 Troubleshooting flow (1) List of troubles Models FDC71VNP, 90VNP1 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 59: Troubleshooting

    '18 • PAC-SM-285 (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 60: Operates But Does Not Heat

    '18 • PAC-SM-285 Green Content Error code None Operates but does not heat 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 61: Earth Leakage Breaker Activated

    '18 • PAC-SM-285 Green Content Error code None Earth leakage breaker activated 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 62: Excessive Noise/Vibration

    '18 • PAC-SM-285 Green Content Error code None Excessive noise/vibration (1/3) 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 63 '18 • PAC-SM-285 Green Content Error code None Excessive noise/vibration (2/3) 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 64: All Models

    '18 • PAC-SM-285 Green Content Error code None Excessive noise/vibration (3/3) Remote control: – – Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page If insufficient cooling/ Adjustment heating problem happens during commissioning due to anomalous operating Does noise/vibration occur when the conditions at cooling/ cooling/heating operation is in...
  • Page 65 '18 • PAC-SM-285 Green Content Error code Louver motor failure None Remote control: Keeps flashing Stays OFF Indoor (FDT, FDE, FDF series) 5. Troubleshooting 1. Applicable model FDT, FDE, FDF series only Diagnosis Countermeasure L Check at the indoor unit side. Operate after waiting for more than 1 minute.
  • Page 66 '18 • PAC-SM-285 Green Error code Content Power source system error Remote control: None (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 Œ and ...
  • Page 67 '18 • PAC-SM-285 Green Content Error code Power source system error None Remote control: (Power source to 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 68 '18 • PAC-SM-285 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 69 '18 • PAC-SM-285 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 70: Communication Error At Initial Operation

    '18 • PAC-SM-285 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 71 '18 • PAC-SM-285 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 72 '18 • PAC-SM-285 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 73 '18 • PAC-SM-285 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 Malfunction by noise Is it possible to Check peripheral reset normally by the environment.

  • Page 74: Communication Error During Operation

    '18 • PAC-SM-285 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 75 '18 • PAC-SM-285 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 76: Applicable Model

    '18 • PAC-SM-285 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 77: Heating Overload Operation

    '18 • PAC-SM-285 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 Defective indoor heat indoor heat exchanger exchanger temperature temperature sensor...
  • Page 78 '18 • PAC-SM-285 Green Content Error code Drain trouble Remote control: (FDT, FDU, FDUM series) Indoor Keeps flashing 1-time flash 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 79 '18 • PAC-SM-285 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 80: Address Setting Error Of Indoor Units

    '18 • PAC-SM-285 Green Content Error code Address setting error of Remote control: indoor units Indoor Keeps flashing Keeps flashing 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 81: Communication Error Between Master And Slave Indoor Units

    '18 • PAC-SM-285 Green Content Error code Communication error Remote control: between master and slave indoor units Indoor Keeps flashing 3-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is it OK the unit address setting for master Correct unit address setting.

  • Page 82: Indoor Fan Motor Anomaly

    '18 • PAC-SM-285 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 83 '18 • PAC-SM-285 Green Content Error code Address setting error of Remote control: master and slave indoor units Indoor Keeps flashing 1-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E18 occurs Is “Master IU address set” function of remote 2.

  • Page 84: Indoor Unit Operation Check, Drain Motor Check Setting Error

    '18 • PAC-SM-285 Green Content Error code Indoor unit operation check, Remote control: Keeps flashing 1-time flash drain motor check setting error Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E19 occurs when the power ON Defective indoor unit Is SW7-1 control PCB (Defective on the indoor control...
  • Page 85 '18 • PAC-SM-285 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 86 '18 • PAC-SM-285 Green Content Error code Defective panel switch Remote control: operation (FDT series) Keeps flashing 1-time flash Indoor 5. Troubleshooting 1. Applicable model FDT series only Diagnosis Countermeasure Is grill opened? Reset the error and close the grill. Does matter improve if panel 2.
  • Page 87 '18 • PAC-SM-285 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 88 '18 • PAC-SM-285 Green Error code Content Remote control: Cooling overload operation 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 89: Discharge Pipe Temperature Error

    '18 • PAC-SM-285 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 90: Seconds Continuously Within 2 Minutes To 2 Minutes

    '18 • PAC-SM-285 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 91: Outdoor Air Temperature Sensor Anomaly

    '18 • PAC-SM-285 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 92: Presumable Cause

    '18 • PAC-SM-285 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 93 '18 • PAC-SM-285 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 94: Current Cut

    '18 • PAC-SM-285 Green Error code Content Remote control: Current cut (1/2) Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the Power source Check power source. voltage OK? Are the 2. Error detection method service valves Open the service valves.
  • Page 95 '18 • PAC-SM-285 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 ➞...

  • Page 96: Active Filter Voltage Error

    '18 • PAC-SM-285 Green Error code Content Remote control: Active filter voltage error Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the power source normal? Restore normal condition. 2. Error detection method Is voltage Restore normal condition.
  • Page 97 '18 • PAC-SM-285 Green Error code Content Remote control: Outdoor fan motor anomaly 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 98 '18 • PAC-SM-285 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 99: 5Kω At 25°C

    '18 • PAC-SM-285 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 100 '18 • PAC-SM-285 Green Green Error code Error code Content 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 101 '18 • PAC-SM-285 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 compressor...
  • Page 102 '18 • PAC-SM-285 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 103: Electrical Wiring

    '18 • PAC-SM-285 3. ELECTRICAL WIRING (1) Indoor units (a) Ceiling cassette-4 way type (FDT) Models FDT71VG, 100VG PJF000Z430...
  • Page 104 '18 • PAC-SM-285 (b) Duct connected-High static pressure type (FDU) Model FDU71VF1 PJG000Z463...
  • Page 105 '18 • PAC-SM-285 Model FDU100VF2 PJG000Z464...
  • Page 106 '18 • PAC-SM-285 (c) Duct connected-Low/Middle static pressure type (FDUM) Model FDUM71VF1 PJG000Z468...
  • Page 107 '18 • PAC-SM-285 Model FDUM100VF2 PJG000Z469...
  • Page 108 '18 • PAC-SM-285 (d) Ceiling suspended type (FDE) Models FDE71VG, 100VG PFA004Z081...
  • Page 109 '18 • PAC-SM-285 (e) Floor standing type (FDF) Models FDF71VD1, 100VD2 PGA000Z783...

  • Page 110: Outdoor Units

    '18 • PAC-SM-285 (2) Outdoor units Model FDC71VNP PCA001Z837...
  • Page 111 '18 • PAC-SM-285 Model FDC90VNP1 PCA001Z838...

  • Page 112: Piping System

    '18 • PAC-SM-285 4. PIPING SYSTEM Model 71 Indoor unit Outdoor unit Heating cycle Cooling cycle Service valve Outdoor air temp. sensor Gas pipe (Flaare connecting) (φ12.7) (TH2) Muffler Discharge pipe Thermistor temp. sensor (Heat (TH3) exchanger) Reducer Check joint (Thi-R3) (Accessory) Thermistor...
  • Page 113 MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 16-5 Konan 2-chome, Minato-ku, Tokyo, 108-8215, Japan http://www.mhi-mth.co.jp/en/ 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.

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