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Mitsubishi FDT125VNPWVH Service Manual
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Mitsubishi FDT125VNPWVH Service Manual

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SERVICE MANUAL
STANDARD INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILINING CASSETTE-4 WAY TYPE
FDT125VNPWVH
DUCT CONNECTED-HIGH STATIC
PRESSURE TYPE
FDUA125VNPWVH
Manual No.'22・
For Australian market only
DUCT CONNECTED-HIGH STATIC
PRESSURE TYPE
FDU125VNPWVH
CEILING SUSPENDED TYPE
FDE125VNPWVH
PAC-SM-412

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Summary of Contents for Mitsubishi FDT125VNPWVH

  • Page 1 PAC-SM-412 SERVICE MANUAL For Australian market only STANDARD INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type) CEILINING CASSETTE-4 WAY TYPE DUCT CONNECTED-HIGH STATIC PRESSURE TYPE FDT125VNPWVH FDU125VNPWVH DUCT CONNECTED-HIGH STATIC CEILING SUSPENDED TYPE PRESSURE TYPE FDE125VNPWVH FDUA125VNPWVH...
  • Page 2 '22 • PAC-SM-412 TABLE OF CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ......2 1.1 Remote control (Option parts) ..............2 1.2 Operation control function by the wired remote control ......5 1.3 Operation control function by the indoor control ........8 1.4 Operation control function by the outdoor control ........27 (1) Compressor speed ..................27 (2) Compressor protection start ...............27 (3) Outdoor fan control ..................27...
  • Page 3 '16 • PAC-T-251 '22 • PAC-SM-412 1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.10.1 Remote control 1.1 Remote control (Option parts) Wired remote control (1) Wired remote control Model RC-EX3A Model RC-EXZ3A ⑤ LCD (with backlight) ③...
  • Page 4 '22 • PAC-SM-412 Wired remote control Model RC-E5 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 5 '22 • PAC-SM-412 '16 • PAC-T-251 Wireless remote control (2) Wireless remote control RCN-E2 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 6 '16 • PAC-T-251 '22 • PAC-SM-412 1.10.2 Operation control function by the wired remote control 1.2 Operation control function by the wired remote control ● Model RC-EXZ3A ●Model RC-EX3A (1) Switching sequence of the operation mode switches of remote control (1) Switching sequence of the operation mode switches of remote control (a) Tap the change operation mode button on the TOP screen.
  • Page 7 '22 • PAC-SM-412 ●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 8 '22 • PAC-SM-412 ● 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 9 '22 • PAC-SM-412 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. (When the switching of cooling mode ↔ heating mode takes place within 3 minutes, the compressor does not operate for 3 minutes by the control of 3-minute timer.) This will facilitate the cooling/heating switching operation in intermediate seasons and the adaptation to unmanned operation at stores, etc (ATM corner of bank).
  • Page 10 '22 • PAC-SM-412 (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 11 '22 • PAC-SM-412 (b) FDU, FDUA, FDE series Return air temperature sensor [Thi-A (by the remote control when the remote control temperature sensor is enabled)] controls the indoor temperature environment simultaneously. (i) O peration 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 fan speed is brought down by one. That speed is retained for 3 minutes after changing the indoor fan speed. (ii) If the return air temperature exceeds the setting temperature by 3°C during dehumidifying operation, the indoor fan speed is raised by one. That speed is retained for 3 minutes after changing the indoor fan speed. (iii) If the thermostat OFF is established during the above control, the indoor fan speed at the thermostat ON is retained so far as the thermostat is turned OFF. (4) Timer operation (a) RC-EXZ3A (i) Sleep timer Set the time from the start to stop of operation. The time can be selected in the range from 30 to 240 minutes (in the unit of 10-minute).
  • Page 12 '22 • PAC-SM-412 (v) Combination of patterns which can be set for the timer operations Item Sleep timer OFF timer ON timer Weekly timer Item Sleep 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...
  • Page 13 '22 • PAC-SM-412 (6) Hot keep Hot keep control is performed at the start of the defrost operation. (a) Contents of operation (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. (7) Auto swing control (FDT, FDE only) Note Even if [Auto Swing] is selected, the louver position with anti draft function is fixed to position 1. (a) RC-EXZ3A (i) Louver control 1) To operate the swing louver when the air-conditioner is operating, press the “Direction” button on the TOP screen...
  • Page 14 '22 • PAC-SM-412 (8) Thermostat operation (a) Cooling (i) Thermostat is operated with the room temperature control. (ii) Thermostat is turned ON or OFF relative to the setting room temperature as shown below. Thermostat ON Temperature drop Thermostat OFF Temperature rise Setting room temperature (iii) Thermostat is turned ON when the room temperature is in the range of -1 < Setting room temperature < +1 at the start of cooling operation (including from heating to cooling). (b) Heating (i) Thermostat is operated with the room temperature control. (ii) Thermostat is turned ON or OFF relative to the setting room temperature as shown below.
  • Page 15 '22 • PAC-SM-412 (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” is selected, the following speed is used for the indoor fans. ・ ForDCmotor:ULo (iii) When the “Set fan speed” is selected, it is operated with the set fan speed also in the thermostat OFF condition. (iv) If the “Intermittence” is selected, following controls are performed: 1) If the thermostat is turned OFF during the cooling operation, the indoor fan motor stops. 2) Indoor fan OFF is fixed for 5 minutes. After the 5 minutes, the indoor fan is operated at ULo for 2 minutes. In the meantime the louver is controlled at level. 3) After operating at ULo for 2 minutes, the indoor fan moves to the state of 1) above. 4) If the thermostat is turned ON, the fan starts operation at set fan speed. 5) When the cooling thermostat is turned OFF, the remote control displays the temperature detected at the fan stop and revises the temperature later when the indoor fan changes from ULo to stop.
  • Page 16 '22 • PAC-SM-412 (11) Drain pump control (a) This control is operated when the inverter frequency is other than 0 rps 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 (a) above after turning the drain pump ON, and then stops. The 5-minute delay continues also in the event of anomalous stop.
  • Page 17 '22 • PAC-SM-412 (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. (14) Cooling, dehumidifying frost protection (a) To prevent frosting during cooling mode or dehumidifying mode operation, the compressor-OFF if the indoor heat exchanger temperature (detected with Thi-R) drops to 1.0 °C or lower at 4 minutes after the compressor-ON. If the indoor unit heat exchanger temperature is 1.0 °C or lower after 5 minutes, the indoor unit is controlled compressor-OFF.
  • Page 18 '22 • PAC-SM-412 (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 19 '22 • PAC-SM-412 (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 -50°C or lower or the heat exchanger temperature sensor detect -50°C or lower for 5 seconds continuously, the compressor stops. After 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). (b) Short-circuit detection If the heat exchanger temperature sensor detects short-circuit for 5 seconds continuously within 2 minutes to 2 minutes 20 seconds after the compressor ON during cooling operation, the compressor stops (E6).
  • Page 20 '22 • PAC-SM-412 (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 Indoor/outdoor units stop the operation, and [E63] is displayed. 5 Setting temperature shift Set temperature is shifted by +2/-2°C in cooling/heating. 6 Forced thermo-OFF Unit goes thermo off. 7 Temporary stop Refer to [(22) Temporary stop input] 8 Silent mode Outdoor unit silent mode is activated. (i) In case of “Level input”...
  • Page 21 '22 • PAC-SM-412 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 control can be can be operated.
  • Page 22 '22 • PAC-SM-412 (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 23 '22 • PAC-SM-412 (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 (b) In case of “pulse input” setting (Local setting) It is effective only when the input signal is changed OFF→ON, and “temporary stop/normal operation” is inverted.
  • Page 24 '22 • PAC-SM-412 (24) Fan control at heating startup (a) Starting conditions At the start of heating operation and after the end of hot start control, if the difference of setting temperature and return air temperature is 5°C or higher, this control is performed. (b) Contents of control (i) S ampling 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 (ii) I f the indoor heat exchanger temperature drops below 37°C at next sampling, present number of revolutions of indoor fan speed is reduced by 10min (c) Ending conditions Indoor fan speed is reduced to the setting air flow rate when the compressor OFF is established and at 30 minutes after the start of heating operation. (25) Room temperature detection temperature compensation during heating With the standard specification, the compressor is turned ON/OFF with the thermostat setting temperature. When the thermostat is likely to turn OFF earlier because the unit is installed at the ceiling where warm air tends to accumulate, the setting can be changed with the wired remote control indoor unit function “...
  • Page 25 '22 • PAC-SM-412 (32) Fan circulator operation (RC-EXZ3A only) When the fan is used for circulation, the unit is operated as follows depending on the setting with the remote control. (a) I f the invalid is selected with the remote control, the fan is operated continuously during the fan operation. (normal fan mode) (b) I f 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. (33) The operation judgment is executed every 5 minutes (RC-EXZ3A only) Setting temperature Ts is changed according to outdoor temperature.
  • Page 26 '22 • PAC-SM-412 (37) Motion sensor control (RC-EXZ3A 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) I nfrared (motion) sensor setting: Installation setting of remote control The indoor unit which is set to “Enable” become valid. (b) I nfrared (motion) sensor control: Energy-saving setting of remote control The function which is set to “Enable” become valid. RC-EXZ3A TOP screen Menu  Service setting  Installation settings  Service password ② Installation settings menu #2 ⑰ Infrared (motion) sensor setting Menu Installation settings 16:14 (Mon)
  • Page 27 '22 • PAC-SM-412 (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 activity is low +3ºC When the extent of human COOL High activity is high When there is no one in the temperature None...
  • Page 28 '22 • PAC-SM-412 1.4 Operation control function by the outdoor control (1) Compressor speed Unit: rps Mode Cooling Heating Item Upper limit 90 (74) 90 (70) Lower limit Note (1) Valuc in ( ) are for the silent mode. (2) Compressor protection start (a) Compressor protection start I (i) Operating condition When the compressor is turned ON from the state of OFF...
  • Page 29 '22 • PAC-SM-412 (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 Cooling – – 0-21 21-32 32-44 44-49 49-70 Heating –...
  • Page 30 '22 • PAC-SM-412 (ii) Heating 1) 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 2) Detail of operation After the outdoor fan operates at -3 speed for 60 seconds; the corresponding outdoor heat exchanger temperature shall imple- ment the following controls. a) Outdoor heat exchanger temperature = < 10ºC A fter the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temper- ature is lower than 10ºC, gradually increase the outdoor fan speed by 1 speed. b) 10ºC < Outdoor heat exchanger temperature = < 13ºC A fter the outdoor fan speed maintains for 20 seconds; if the outdoor heat exchanger temperature is 10ºC - 13ºC, maintain outdoor fan speed again. c) Outdoor heat exchanger tempeature > 13ºC After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger temper- ature is higher than 13ºC, gradually reduce outdoor fan speed by 1 speed. (Lower limit 2nd speed) 3) Reset conditions When either of the following conditions is satisfied a) The outdoor air temperature (TH2) is 11ºC or lower. b) The compressor speed is 0 rps.
  • Page 31 '22 • PAC-SM-412 (b) Ending conditions (Operation returns to the heating cycle when either one of the following is satisfied.) (i) Outdoor heat exchanger sensor (TH1) temperature: 10ºC or higher (ii) Continued operation time of defrost operation → For more than 15 minutes • Defrost operation Heating operation Max. 15 minutes 2-7 minutes Hot start operation Depends on an operation condition, the time can be longer than 7 minutes. (5) Cooling overload protective control (5) Cooling overload protective control (a) Operating conditions (a) Operating conditions When the outdoor air temperature (TH2) is 39°C or higher continues for 30 seconds while the compressor speed is other than...
  • Page 32 lower limit After lapse of 20 sec. or over speed 30 rps 0rps '22 • PAC-SM-412 Outdoor heat exchanger temperature (°C) (7) Cooling low outdoor air 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 (b) Detail of operation (i) The lower limit of the compressor speed is set to 40 (30) <14> rps and even if the speed becomes lower than 40 (30) <14> rps, the speed is kept to 40 (30) <14> rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
  • Page 33 '22 • PAC-SM-412 (9) Heating overload protective control (a) Operating conditions When the outdoor air temperature (TH2) is 13°C or higher continues for 30 seconds while the compressor speed is other than 0 rps (b) Detail of operation 65(65)rps calculation exceeds the upper limit, the upper limit value is maintained.
  • Page 34 '22 • PAC-SM-412 (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. (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. Operation starts again after a delay time of 3 minutes. (13) Current cut (a) Purpose Inverter is protected from overcurrent. (b) Detail of operation Output current from the inverter is monitored with a shunt resistor and, if the current exceeds the setting value, the compressor is stopped immediately. Operation starts again after a delay time of 3 minutes. (14) Outdoor unit failure This is a function for determining when there is trouble with the outdoor unit during air-conditioning.
  • Page 35 '22 • PAC-SM-412 (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 FDC125VNP-W Cooling: 7th speed, Heating: 7th speed (19) Broken wire detection on temperature sensor (a) Outdoor unit heat exchanger temperature 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 or with in 20 seconds after power 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 36 '22 • PAC-SM-412 (d) Detail of opepation (i) Change operation mode to cooling. (ii) The compressor speed is fixed at 40 rps. (iii) The opening of the EEV is fixed at 470 pulses. 1) When outdoor air temperature(TH2) and discharge pipe temperature(TH3) are in the control range (A) ①Refrigerant ejection control (2 minutes) ②Compressor stop (1 minute) ③Normal heating operation 2) When outdoor air temperature(TH2) and discharge pipe temperature(TH3) are in the control range (B) ①Refrigerant ejection control (2 minutes) ②Compressor stop (1 minute) ③Refrigerant ejection control (2 minutes) ④Compressor stop (1 minute) ⑤Refrigerant ejection control (2 minutes) ⑥After stopping the compressor for 3 minutes, start heating operation. Control range(A) (-15,0) Control range(B) TH2[°C]...
  • Page 37 '22 • PAC-SM-412 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 '22 • PAC-SM-412 (ii) Outdoor unit Remote control Indoor unit control PCB Reference Location of trouble Description of trouble Repair method Green Error code Red LED Red LED page Installation, operation status • Higher outdoor heat exchanger temperature Repair Replacement, repair Outdoor heat exchanger Keeps • D efective outdoor heat exchanger temperature sensor of temperature Stays OFF temperature sensor...
  • Page 39 '22 • PAC-SM-412 (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 • Displays the error of higher priority (When plural errors are persisting) control Red LED on indoor unit •...
  • Page 40 '22 • PAC-SM-412 ■ Error log and reset Error indicator Memorized error log Reset • S top the unit by pressing the ON/OFF Remote control display • Higher priority error is memorized. switch of remote control. • I f the unit has recovered from anomaly, it Red LED on indoor unit control PCB • Not memorized. can be operated. ■ Resetting the error log 1) RC-EXZ3A •...
  • Page 41 '22 • PAC-SM-412 (ii) Instruction of how to replace indoor unit control PCB SAFETY PRECAUTIONS Read the "SAFETY PRECAUTIONS" carefully first of all and then strictly follow it during the replacement in order to protect yourself. The precautionary items mentioned below are distinguished into two levels, WARNING and CAUTION. Both mentions the important items to protect your health and safety so strictly follow them by any means.
  • Page 42 '22 • PAC-SM-412 (b) Models FDU, FDUA, FDE series 1) 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 '22 • PAC-SM-412 2) 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 44 '22 • PAC-SM-412 3) Motor control PCB i ) Replace the PCB ① Take off the connection of connector and remove the screw of power transistor then remove the PCB. Wipe off the silicon grease neatly on the control’s radiation heat fins. ②...
  • Page 45 '22 • PAC-SM-412 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. Unless the power is reset, the error log is saved in memory and the inspection indicator lamps on outdoor unit PCB keep flashing after automatical recovering from malfunction. After automatical recovering from malfunction, if any another error mode which has a higher priority than the previous error saved in memory occurs, it is overwritten in memory and is displayed. [Reset of power source] Be sure to avoid electrical shock, when replacing or checking the outdoor unit PCB, because some voltage is still retained in the electrolytic capacitor on the PCB even after shutting down the power source to the outdoor unit.
  • Page 46 '22 • PAC-SM-412 • Model FDC125VNP-W 1. To remove the service panel (1) Remove 5 service panel xing screws and remove it. 2. To remove the fan motor (FM) (1) Remove the service panel.(See No.1.) (2) Disconnect the motor connector(FMxx or CNFxx) on PCB in control box. (3) Remove 4 fan guard xing screws and remove it.(←...
  • Page 47 '22 • PAC-SM-412 6. To remove the compressor (CM) (1) Remove the service panel.(See No.1.) (2) Remove the insulation which covers compressor. (Strings (a),(b) should be loosen.) (3) Remove the terminal cover xing bolt and remove it, and disconnect the power wiring. □...
  • Page 48 '22 • PAC-SM-412 Outdoor unit control failure diagnosis circuit diagram ◆ Check point of outdoor unit...
  • Page 49 '22 • PAC-SM-412 ◆ Check point of inverter outdoor unit...
  • Page 50 '22 • PAC-SM-412 Model FDC125VNP-W ◆ Check point of outdoor unit...
  • Page 51 '22 • PAC-SM-412 Check of anomalous operation data with the remote control (a) In case of RC-EXZ3A remote control [Operating procedure] ➀ On the TOP screen, touch the buttons in the order of “Menu” ➝ “Service setting” ➝ “Service & Maintenance” ➝ “Service password”...
  • Page 52 '22 • PAC-SM-412 (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 53 '22 • PAC-SM-412 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 54 '22 • PAC-SM-412 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 55 '22 • PAC-SM-412 2.2 Troubleshooting flow (1) List of troubles Model FDC125VNP-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 56 '22 • PAC-SM-412 (2) Troubleshooting Green Content Error code Remote control: None Operates but does not cool. Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and supply air.
  • Page 57 '22 • PAC-SM-412 Green Content Error code Remote control: Operates but does not heat. None Indoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and supply air. It is normal.
  • Page 58 '22 • PAC-SM-412 Green Content Error code Remote control: Earth leakage breaker activated None Indoor Stays OFF Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are OK the insulation resistance and Replace compressor. resistance between terminals compressor? (1)0.448Ω...
  • Page 59 '22 • PAC-SM-412 Green Content Error code Remote control: Excessive noise/vibration (1/3) None 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 60 '22 • PAC-SM-412 Green Content Error code Remote control: Excessive noise/vibration (2/3) None Indoor – – 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting the casing. casing? [Unit side] It is noise/vibration that...
  • Page 61 '22 • PAC-SM-412 Green Content Error code Remote control: Excessive noise/vibration (3/3) None Indoor – – 5. Troubleshooting 1. Applicable model 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 62 '22 • PAC-SM-412 Green Content Error code Louver motor failure Remote control: None (FDT, FDE series) Indoor Keeps flashing Stays OFF 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 63 '22 • PAC-SM-412 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 64 '22 • PAC-SM-412 Green Content Power source system error Error code None (Power source to remote control) Remote control: Keeps flashing 3-time flash Indoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are there any Correct it. loose connection of remote control wires? 2.
  • Page 65 '22 • PAC-SM-412 Green Content Error code INSPECT I/U Remote control: INSPECT I/U Indoor Keeps flashing Stays OFF (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 66 '22 • PAC-SM-412 Green Content Error code INSPECT I/U Remote control: INSPECT I/U Indoor Keeps flashing Stays OFF (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 67 '22 • PAC-SM-412 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 68 '22 • PAC-SM-412 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 69 '22 • PAC-SM-412 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 70 '22 • PAC-SM-412 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 71 '22 • PAC-SM-412 Green Content Error code Remote control: Communication error during operation Indoor Keeps flashing 2-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure ● In case that the outdoor unit red LED flashes 2-time Note (1) Inspect faulty connections (disconnection, looseness) on the outdoor unit terminal block.
  • Page 72 '22 • PAC-SM-412 Green Content Error code Indoor heat exchanger Remote control: Indoor temperature sensor anomaly Keeps flashing 1-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of indoor heat Correct it. ➞ Insert connector exchanger temperature sensor securely.
  • Page 73 '22 • PAC-SM-412 Green Content Error code Return air temperature Remote control: Indoor sensor anomaly Keeps flashing 1-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of return Correct it. ➞ Connect air temperature sensor connector.
  • Page 74 '22 • PAC-SM-412 Green Content Error code Heating overload operation Remote control: Indoor Keeps flashing 1-time flash 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 75 '22 • PAC-SM-412 Green Content Error code Drain trouble Remote control: (FDT, FDU, FDUA series) Indoor Keeps flashing 1-time flash 5. Troubleshooting 1. Applicable model FDT, FDU, FDUA series Diagnosis Countermeasure Check the error data in the remote control. Is there any overflow? Is DC12V at CNI connector? Check float switch.
  • Page 76 '22 • PAC-SM-412 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 Are more than 17 indoor units connected to one Defective remote control remote control?
  • Page 77 '22 • PAC-SM-412 Green Content Error code Address setting error of Remote control: Indoor indoor units Keeps flashing Stays OFF 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 78 '22 • PAC-SM-412 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 series FMi2 only. 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign material Remove foreign material.
  • Page 79 '22 • PAC-SM-412 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 80 '22 • PAC-SM-412 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 series FMi2 only. 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign material...

  • Page 81: Table Of Contents

    '22 • PAC-SM-412 Green Content Error code Remote control Remote control: Indoor temperature sensor anomaly Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the remote Correct connector. control temperature sensor connected properly? 2. Error detection method Are the characteristics of Is the remote...

  • Page 82: Applicable Model

    '22 • PAC-SM-412 Green Content Error code 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 sensor, refer to E37. the characteristics of Replace outdoor heat outdoor heat exchanger temperature sensor...
  • Page 83 '22 • PAC-SM-412 Green Content Error code Discharge pipe Remote control: temperature error Indoor control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * For the characteristics of discharge Are the pipe temperature sensor, refer to E39. characteristics of Replace discharge pipe discharge pipe temperature...

  • Page 84: When The Temperature Sensor

    '22 • PAC-SM-412 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 85 '22 • PAC-SM-412 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 86 '22 • PAC-SM-412 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 87 '22 • PAC-SM-412 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 88 '22 • PAC-SM-412 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 89 '22 • PAC-SM-412 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 90 '22 • PAC-SM-412 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 91: Minutes After The Initial Detection

    '22 • PAC-SM-412 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 92 '22 • PAC-SM-412 Green Green Content Error code Error code 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 93 '22 • PAC-SM-412 Green Insufficient refrigerant amount Error code Content or detection of service valve closure Remote control: 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 94 '22 • PAC-SM-412 Green Green Error code Content Error code Content Current safe stop Current safe stop Keeps flashing Stays Off Indoor Remote controller: E58 Remote control: Indoor Keeps flashing Stays OFF (Model SRC50, 60) 3 time flash Outdoor ― 5.
  • Page 95 '22 • PAC-SM-412 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.
  • Page 96 '22 • PAC-SM-412 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 Check and correct the power source voltage power source voltage. Reset the power source and restart operation. 2.
  • Page 97 '22 • PAC-SM-412 2.3 Zone control installation manual (FDU, FDUA series only) ① b) In the case of 3 zones System outline Please refer to the following information to design your ducted air-conditioning system. Master Zone Attention Remote Control Relay Parts Ducted indoor unit •...
  • Page 98 '19 • PAC-SM-316 '22 • PAC-SM-412 ⑤  ④ ④ Wirings Wirings Method to set the large air volume of FDU, FDUA (FDU 125, FDUA125 only) a) Connecting of indoor unit and relay parts a) Connecting of indoor unit and relay parts •...
  • Page 99 '22 • PAC-SM-412 ⑥ ZONE CONTROL INITIAL SETTING Initial setting (Contiued) ⑥ Select Zone settings ⑥ Initial setting Performs zone settings. When using zone control, configure the following settings from the zone remote control. (1) Zone setting ① Tap Menu button on the top screen.
  • Page 100 '22 • PAC-SM-412 ⑥ ⑥ Initial setting (Contiued) Initial setting (Contiued) Resets all zone settings. The zone name input screen is displayed. If this is acceptable, tap the The zone name can be set with up to 8 button. 2-byte letters (16 1-byte letters). You can enter alphanumeric or Cyrillic.
  • Page 101 '22 • PAC-SM-412 Troubleshooting Symptoms Assumed Causes Solutions Faulty damper motor Replace damper motor. Relay and damper motor Check wiring, ensure zone opens and closes ∙No air flow incorrectly wired. correctly. ∙  I f there is no common zone, Fuse blown Investigate cause and replace blown fuse.
  • Page 102 '22 • PAC-SM-412 Names and functions of sections on the R/C (Display) ＊All icons are shown for the sake of explanation. ② Icon display TOP screen ③ Menu button ① Clock, Room name display ⑤ Change set temp button ④ Change operation ⑥...
  • Page 103 '22 • PAC-SM-412 Zone ON/OFF operation (for zone control) The "Zones" button appears on the TOP screen when zone settings were performed by Menu ⇒ Service setting ⇒ Installation setting ⇒ Duct unit setting ⇒ Zone setting . Tap the Zones button. Sets ON / OFF (OPEN/CLOSE) for each zone.
  • Page 104 '22 • PAC-SM-412 Tap the zone you want to set a zone name for. The zone name input screen is displayed. The zone name can be set with up to 8 2-byte letters (16 1-byte letters). You can enter alphanumeric or Cyrillic. Tap the Back or Next button to display next character group.
  • Page 105 '22 • PAC-SM-412 ■Set ON timer by hour When the set time elapses, the air conditioner starts. ⇒ Timer ⇒ Tap the Menu button on the TOP screen and select Useful functions Set ON timer by hour . The Set ON timer by hour setting Set the following operating conditions.
  • Page 106 '22 • PAC-SM-412 ■Set OFF timer by hour When the set time elapses, the air-conditioner stops. ⇒ Timer ⇒ Tap the Menu button on the TOP screen and select Useful functions Set OFF timer by hour The Set OFF timer by hour setting screen is displayed. ▲...
  • Page 107 '22 • PAC-SM-412 Advice Warming up · o l c t t r i t a t t r i t a s a l i t a starts the operation 5 to 60 minutes earlier. · l r a r e i t r a i t a...
  • Page 108 '22 • PAC-SM-412 ■Set OFF timer by clock Stops the operation of the unit at the set clock time. ⇒ Timer ⇒ Tap the Menu button on the TOP screen and select Useful functions Set OFF timer by clock The Set OFF timer by clock setting screen is displayed. ▲...
  • Page 109 '22 • PAC-SM-412 Weekly timer You can set four on timer and off timer operations for each day of the week. Advice · The Clock setting must be made when the weekly timer is used. · The weekly timer can be set from the main R/C only. ⇒...
  • Page 110 '22 • PAC-SM-412 Set the following operating conditions. Tap a desired operation mode. ① Warming up ON/OFF When the No setting button is Weekly timer Weekly timer (Operation starts 5 to 60 minutes Details tapped, it operates with the same Cooling earlier in order to warm up the room Cooling...
  • Page 111 '22 • PAC-SM-412 3. ELECTRICAL WIRING (1) Indoor units (a) Ceiling cassette-4 way type (FDT) Model FDT125VH PJF000Z735...
  • Page 112 '22 • PAC-SM-412 (b) Duct connected-High static pressure type (FDU) Model FDU125VH PJG000Z653...
  • Page 113 '22 • PAC-SM-412 (c) Duct connected-High static pressure type (FDUA) Model FDUA125VH PJG000Z741...
  • Page 114 '22 • PAC-SM-412 (d) Ceiling suspended type (FDE) Model FDE125VH PFA004Z087...
  • Page 115 '22 • PAC-SM-412 (2) Outdoor unit Model FDC125VNP-W PCA002Z011...
  • Page 116 (Heat (TH1) exchanger) Receiver Service valve Capillary tube (Thi-R1) Electronic (Flaare connecting) expansion valve Temperature sensor (Heat Liquid pipe '22 • PAC-SM-412 (EEV) exchanger) (φ6.35) Capillary tube (Thi-R2) Strainer Strainer Reducer 4. PIPING SYSTEM (Accessory) '19 • PAC-DB-333 7. PIPING SYSTEM Indoor unit Outdoor unit Model 125...
  • Page 117 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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