Mitsubishi Heavy Industries FDE40ZSXW1VH, Service Manual

Page 1: ... AIR CONDITIONERS Split system air to air heat pump type CEILING CASSETTE 4 WAY COMPACT TYPE FDTC40ZSXW1VH 50ZSXW1VH 60ZSXW1VH DUCT CONNECTED LOW MIDDLE STATIC PRESSURE TYPE FDUM40ZSXW1VH 50ZSXW1VH 60ZSXW1VH FDE40ZSXW1VH 50ZSXW1VH 60ZSXW1VH CEILING SUSPENDED TYPE ...

Page 2: ...d protection 16 16 Anomalous fan motor 16 17 Plural unit control Control of 16 units group by one remote control 17 18 High ceiling control 17 19 Abnormal temperature sensor return air indoor heat exchanger broken wire short circuit detection 18 20 External input output control CnT or CnTA 18 21 Operation permission prohibition 20 22 Temporary stop input 22 23 Selection of cooling heating external...

Page 3: ... 11 Outdoor unit failure 30 12 Serial signal transmission error protection 30 13 Rotor lock 30 14 Outdoor fan motor protection 30 15 Outdoor fan control at low outdoor temperature 30 16 Refrigeration cycle system protection 31 2 MAINTENANCE DATA 32 2 1 Diagnosing of microcomputer circuit 32 1 Selfdiagnosis function 32 2 Troubleshooting procedure 35 3 Troubleshooting at the indoor unit 35 4 Trouble...

Page 4: ...ht lighting can be changed If the backlight is ON setting when the screen is tapped while the backlight is turned off the backlight only is turned on Operations with switches and are excluded USB port USB connector mini B allows connecting to a personal computer For operating methods refer to the instruction manual attached to the software for personal computer remote control utility software Note...

Page 5: ...de Cover AIR CON No button Display the indoor unit number connected to this remote control CHECK button This button is used at servicing TEST button This button is used during test operation Weekly timer display Displays the settings of the weekly timer Operation setting display area Displays setting temperature air flow volume operation mode and oparation message Operation check indicator light D...

Page 6: ...set CPU from the remote control as follows TOP screen Menu Service setting Service Maintenance Service password The selected screen is displayed The selected screen is displayed Service Maintenance 2 Special settings CPU reset Microcomputers of indoor unit and outdoor unit connected are reset State of restoration after power failure 3 Power failure compensation function Electric power source failu...

Page 7: ...function items are saved in the memory of indoor unit g Weekly timer peak cut timer or silent mode timer settings h Remote control function setting Please check the I U Set clock first on the initializing screen set the timer Other thanA C is connected 4 Alert displays If the following a to c appear check and repair as follows Communication check screen This appears if communications cannot be est...

Page 8: ...tate of stop is memorized Although the timer mode is cancelled at the recovery from power failure the setting of weekly timer is changed to the holiday setting for all weekdays b Operation mode c Air flow volume mode d Room temperature setting e Louver auto swing stop However the stop position 4 position is cancelled so that it returns to Position 1 f Remote control function items which have been ...

Page 9: ... of the temperature shown at right 3 3 Cooling operation Heating operation Room temperature detected with Thi A deg 59 56 Heating operation stopped cooling Heating OK Indoor heat exchanger temperature C b The following automatic controls are performed other than a above i Cooling or heating operation mode is judged according to the conditions of the Judgment based on Setting temperature Cooling se...

Page 10: ...d Outdoor temperature Heating Outdoor air tem perature Operation mode Heating 3 The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes 4 In the range where the above cooling and heating zones are overlapped Forced thermostat OFF Forced thermostat OFF Forced thermostat OFF Room temperature Cooling Room temperature Heating Outdoor air temperature Indoor return ai...

Page 11: ... enabled disabled iv Set ON timer by clock Set the time to start operation The time can be set in the unit of 5 minute This setting can be activated only once or at every time It is allowed also to set simultaneously the indoor temperature operation mode air flow rate and warm up enabled disabled Note 1 It is necessary to set the clock to use this timer v Set OFF timer by clock Set the time to sto...

Page 12: ...ature sensor Thi R1 or R2 whichever higher detects 25 C or lower the fan is turned OFF and does not operate ii When the heat exchanger temperature sensor Thi R1 or R2 whichever higher detects 25 C or higher the fan operates with the fan control at heating thermostat OFF iii When the heat exchanger temperature sensor Thi R1 or R2 whichever higher detects 35 C or higher the fan operates with the set...

Page 13: ...e control If the auto swing signal is received from the remote control the auto swing will start from the position before the stop b RC E5 i Louver control 1 Press the LOUVER button to operate the swing louver when the air conditioner is operating SWING is displayed for 3 seconds and then the swing louver moves up and down continuously 2 To fix the swing louver at a position press one time the LOU...

Page 14: ...at exchanger temperature sensors both Thi R1 and R2 detect 25 C or lower 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 it moves to the hot start control 5 When the heating...

Page 15: ...ed the fan on the indoor unit of which the thermostat has been turned OFF is turned OFF The same occurs also when the remote control sensor is effective 9 Filter sign As the operation time Total ON time of ON OFF switch accumulates to 180 hours 1 FILTER CLEANING is displayed on the remote control This is displayed when the unit is in trouble and under the central control regardless of ON OFF Notes...

Page 16: ...in detection switch OFF releases the forced drain pump ON condition Normal state 1 2 Normal state Drain detection switch ON Stop 1 Indoor unit operation mode Control A Control B Compressor ON Compressor OFF Cooling Dry Heating Fan 2 Notes 1 Including the stop from the cooling dehumidifying fan and heating and the anomalous stop 2 Including the Fan operation according to the mismatch of operation m...

Page 17: ...alous stop E20 b Selection of indoor fan speed If it enters the frost prevention control during cooling operation excluding dehumidifying the indoor fan speed is switched i When the indoor return air detection temperature detected with Thi A is 23 C or higher and the indoor heat exchanger temperature detected with Thi R detects the compressor frequency drop start temperature A C 1 C of indoor fan ...

Page 18: ...ted are displayed ii In case of RC E5 remote control Pressing AIR CON No button on the remote control displays the indoor unit address If button is pressed at the next it is displayed orderly starting from the unit of smallest No d In case of anomaly If any anomaly occurs on a unit in a group a protective function operates that unit stops with the anomalous stop but any other normal units continue...

Page 19: ...CnT CnT CnTA CnT CnTA Operation stop pulse CnT CnT CnT CnTA CnT CnT CnTA CnT CnTA Operationpermission prohibitionlevel CnT CnTA CnT CnTA CnT CnTA CnT CnT CnTA CnT CnTA Operation permission prohibition pulse CnT CnT CnT CnTA CnT CnT CnTA CnT CnTA Cooling heating selection level CnT CnTA CnT CnTA CnT CnTA CnT CnTA CnT CnT Cooling heating selection pulse CnT CnTA CnT CnTA CnT CnTA CnT CnTA CnT CnT 20...

Page 20: ...ooling 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 ii In case of Pulse input setting Local setting It is effective only when the input signal to CnT 6 or CnTA is changed OFF ON and at that time unit operation ON OFF is inverted ON ON OFF OFF OFF ON ON ON ON Remote control OFF Remote control O...

Page 21: ... OFF Operation Stop Operation permission 1 Operation prohibition Unit stops 1 Only the LEVEL INPUT is acceptable for external input however when the indoor function setting of Level input Factory default or Pulse input is selected by the function for External input of the wired remote control operation status will be changed as follows In case of Level input setting In case of Pulse input setting ...

Page 22: ...ne Actual operation Remote control CnT Operation stop pulse CnTA Operation permission prohibition level Operation permission prohibition zone Actual operation Remote control Remote control ON Remote control OFF Remote control ON Remote control ON Remote control OFF Remote control ON ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF ON ON OFF ON ON ON ON ON OFF OFF OFF OFF OFF OFF Operation Operatio...

Page 23: ...es are inverted Cooling Heating or Heating Cooling d If the cooling heating selection signal is given by the external input the operation mode is transmitted to the remote control Selection of cooling heating external input function External input selection External input selection Cooling heating selection External input method Level External terminal input CnT or CnTA Cooling heating Cooling hea...

Page 24: ...emperature by the return air temperature sensor and the measured temperature after installing the unit a It is adjustable in the unit of 0 5 C with the wired remote control indoor unit function RETURN AIR TEMP 1 0 C 1 5 C 2 0 C 1 0 C 1 5 C 2 0 C b Compensated temperature is transmitted to the remote control and the compressor to control them Note 1 The detection temperature compensation is effecti...

Page 25: ...the return air temperature According to temperature difference between set temperature and return air temperature indoor fan tap are controlled automalically Auto 1 Changes the indoor fan tap within the range of Hi Me Lo Auto 2 Changes the indoor fan tap within the range of P Hi Hi Me Lo 35 Indoor unit overload alarm RC EX3A only If the following condition is satisfied at 30 minutes after starting...

Page 26: ... off control When no activity is detected for 1 hour unit will go stand by mode Unit will re start operation automatically with the original set temperature by activity detection during the stand by mode When stand by mode continues for 12 hours unit stops Compressor keeps stopped regardless of the set temperature Notes 1 When the following operations are set power saving control will be canceled ...

Page 27: ...66rps 12 78rps 12 90rps In case satisfied all of following conditions Connect compressor speed 0 rps 10 times or more Satisfy 1 2 and 3 conditions above Outdoor air temperature is 3 C or less i ii i ii iii vi v 20 20 15 10 5 0 5 10 15 10 5 0 Outdoor air temperature Outdoor heat exchanger temperature 20 20 15 10 5 0 5 10 15 10 5 0 Outdoor air temperature Outdoor heat exchanger temperature Defrost o...

Page 28: ...ature C 8rps 1 8rps 1 0rps After lapse of 30 sec or over 3 After lapse of 30 sec or over 3 After lapse of 30 sec or ove Notes 1 When the outdoor heat exchanger temperature is in the range of P2 P3䉝 the speed is reduced by 8 rps at each 20 seconds 2 When the temperature is P3䉝㻌or higher the compressor is stopped 3 When the outdoor heat exchanger temperature is in the range of P1 P2䉝 if the compress...

Page 29: ...56 52 5 52 5 50 8 50 8 42 42 55 58 58 58 56 2 56 2 47 3 47 3 58 61 61 61 61 61 10 10 THi R 5 Heating high pressure control a Starting condition When the indoor heart exchanger temperature Thi R has risen to a specified temperature while the compressor is turned on b Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following table 6 Heating ...

Page 30: ...essor speed is 0 rps 4 6 8 10 12 2 4 Lower limit 35 rps Lower limit 45 rps Lower limit 45 rps Lower limit 35 rps Normal operation Outdoor air temperature C 6 8 Compressor overheat protection a Purpose b Detail of operation i Discharge pipe temperature C 180 180 180 Example Fuzzy 95 105 115 180 105 180 105 the com ii j Current safe i Purpose ii Detail of operation k Current cut i Purpose ii Detail ...

Page 31: ... of operation iii Reset conditions Outdoor air temperature 10 C Outdoor air temperature 10 C Outdoor fan a b c min 1 21 C 38 C 09 SRK DB 087D 12 Serial signal transmission error protection a a Purpose b Detail of operation 13 Rotor lock 14 Outdoor fan motor protection 15 Outdoor fan control at low outdoor temperature Cooling i Operating conditions ii Detail of operation iii Reset conditions Outdoo...

Page 32: ...of operation 3 Reset conditions b a b a b i ii c When A minutes have elapsed after the compressor ON or the completion of the defrost operation Other than the defrost operation iii When after satisfying the conditions of 1 and 2 above the compressor speed indoor air temperature Thi A and indoor heat exchanger temperature Thi R have satisfied the conditions in the following table for 5 minutes 3 2 ...

Page 33: ...contact of temperature sensor connector Replacement repair of temperature sensor 64 Indoor control PCB Defective indoor control PCB Defective temperature sensor input circuit Replacement of PCB 1 time flash Keeps flashing Stays OFF Keeps flashing Indoor return air temperature sensor Defective indoor return air temperature sensor defective element broken wire short circuit Poor contact of temperatu...

Page 34: ...fective temperature sensor input circuit Replacement of PCB Stays OFF Keeps flashing 4 time flash Installation operation status Service valve gas side closing operation Replacement 79 Stays OFF Keeps flashing 1 time flash Outdoor control PCB compressor Current cut Anomalous compressor over current Replacement of PCB 80 81 Installation operation status Service valve closing operation Repair Stays O...

Page 35: ...es continuously after initial communication was established Excessive number of connected indoor units by controlling with one remote control Whenever excessively connected indoor units is detected after power ON Return air temperature sensor anomaly 50 C or lower is detected for 5 seconds continuously within 60 minutes after initial detection of this anomalous temperature Indoor heat exchanger te...

Page 36: ...limit switch transformer and fuse Note 1 With regard to parts of high voltage circuits and refrigeration cycle judge it according to ordinary inspection methods ii Instruction of how to replace indoor control PCB ە Read the SAFETY PRECAUTIONS carefully first of all and then strictly follow it during the replacement in order to protect yourself ە The precautionary items mentioned below are distingu...

Page 37: ... iv Control PCB Parts mounting are different by the kind of PCB 〇 ON OFF Part number SW2 Blue Address setting SW5 Master Slave setting SW7 Function setting CNT Blue External switch CNJ White Louver motor CNN Yellow Thermistor Heat exchanger CNI Blue Float SW CNH Black Thermistor Return air CNW3 Red Power PCB CNB White Remote control CNG Blue CNZ White HA CNE White RAM checker CNW4 Blue Power PCB S...

Page 38: ...t by the kind of PCB 〇 ON OFF item switch Address SW2 〇 〇 Content of control Plural indoor units control by 1 remote control Test run SW7 1 Normal Operation check drain pump motor test run SW6 ON 1 2 3 4 Example setting for 50VH SW6 1 2 3 4 50VH 〇 〇 60VH 〇 〇 〇 40VH 〇 〇 Part number SW5 Master Slave setting SW2 Blue Address setting CNI Blue Float SW CNG Blue Motion sensor CNV2 Black Motion sensor CN...

Page 39: ...he wirings to the PCB Wiring connector color should match with the color of connector of the PCB Screw back the terminal of wiring that was removed in ii Power PCB Parts mounting are different by the kind of PCB Models FDE40 60VH FDUM40 50VH Part number CNM1 White Fan motor CNW1 White Control PCB CNW3 White Terminal block CNW0 White Terminal block b Power PCB Part number CNW3 White Terminal block ...

Page 40: ...freeze control Reserved Reserved Reserved Reserved Reserved Keep OFF Test run drain motor Normal Test run Valid Invalid Normal Invalid Model selection As per model See table 1 Remark Address No setting at plural indoor units control by 1 R C 0 F Switch Description Default setting Table 1 Indoor unit model selection with SW6 1 SW6 4 40VH 50VH 60VH SW6 4 SW6 1 SW6 2 SW6 3 Default setting Note 1 SW8 ...

Page 41: ...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 control PCB because some voltage is still retained in the electrolytic capacitor on the PCB even after shutting down the power source to the o...

Page 42: ...mperature Comp Bottom Temperature Current Target Super Heat Super Heat Discharge Pipe Super Heat Protection State No of The Compressor Outdoor Unit Fan Speed 63H1 On Off Defrost Control On Off Total Running Hours of The Compressor Pulse of The Outdoor Unit Expansion Valve EEVC Pulse of The Outdoor Unit Expansion Valve EEVH 13 Supply Air Temperature ە Details of compressor protection status No 33 N...

Page 43: ...erature anomaly 3 Current safe control of inverter primary current 4 High pressure protection control 5 High pressure anomaly 6 Low pressure protection control 7 Low pressure anomaly 8 Anti frost prevention control 9 Current cut 10 Power transistor protection control 11 Power transistor anomaly Overheat 12 Compression ratio control 13 Spare 14 Dewing prevention control 15 Current safe control of i...

Page 44: ...starting check operation 6 Inverter checker for diagnosis of inverter output Checking method LED U V W LED1 LED3 LED5 LED2 LED4 LED6 LED1 LED3 LED5 LED2 LED4 LED6 LED1 LED3 LED5 LED2 LED4 LED6 LED1 LED3 LED5 LED2 LED4 LED6 LED1 LED3 LED5 LED2 LED4 LED6 LED1 LED3 LED5 LED2 LED4 LED6 ON OFF status of LED If all of LED are ON OFF according to following pattern If all of LED stay OFF or some of LED ar...

Page 45: ...if the voltage oscillates between DC0 and approx 20V Inspection power transistor Remove the faston terminal and test output voltage Inspection of outdoor fan motor See page 45 Check point of outdoor unit Color Color symbol RD Mark Yellow Green Y G Black BK Blue BL Yellow YE White WH Red Display Voltage range Voltage check in PCB The normal range is as follows DC280V DC230V DC310V DC 20V DC 18V DC ...

Page 46: ... 18 PAC SM 298 45 ...

Page 47: ...temperature sensor anomaly 64 E7 Return air temperature sensor anomaly 65 E8 Heating overload operation 66 E9 Drain trouble FDTC and FDUM series 67 E10 Excessive number of connected indoor units more than 17 units by controlling with one remote control 68 E11 Address setting error of indoor units 69 E16 Indoor fan motor anomaly 70 E19 Indoor unit operation check drain pump motor check setting erro...

Page 48: ...the microcomputer control functions Compressor may be stopped by the error detection control For the contents of control refer to anomalous stop control by controlling compressor rotation speed of microcomputor control functions Inspect the followings Minor clogging of filter Minor clogging of heat exchanger Minor short circuit Minor shortage of refrigerant amount Poor compression of compressor Co...

Page 49: ...ol functions Compressor may be stopped by the error detection control For the contents of control refer to anomalous stop control by controlling compressor rotation speed of microcomputor control functions Inspect the followings Minor clogging of filter Minor clogging of heat exchanger Minor short circuit Minor shortage of refrigerant amount Poor compression of compressor Considering appropriate o...

Page 50: ... when the unit has been left for long time without power source the insulation resistance may drop to a few MΩ because of refrigerant migrated in the compressor When the earth breaker is activated at lower insulation resistance check the following points When power ON crankcase heater heat up compressor and evaporate the refrigerant migrated in the compressor Check if the earth leakage breaker is ...

Page 51: ...s into the gap if necessary Prevent the vibration from transmitting to wall and etc by fixing pipes on the wall or wrapping rubber cushion around the pipe which goes through the hole in the wall or applying other appropriate means Strength of ceiling wall floor etc may be insufficient Review the installing position or reinforce it Check for leaning of installed unit or anomalous mounting of fan lo...

Page 52: ...hrough inside of piping of air conditioner It is likely to occur particularly during cooling or defrost operation in the heating mode It is normal The noise vibration occurs when the refrigerant starts or stops flowing It is normal When the defrost operation starts or stops during heating the refrigerant flow is reversed due to switching 4 way valve This causes a large change in pressure which pro...

Page 53: ...Intrusion of air nitrogen etc In such occasion it is necessary to recover refrigerant vacuum dry and recharge refrigerant Since there could be many causes of noise vibration the above do not cover all In such case check the conditions when where how the noise vibration occurs according to following check point Indoor outdoor unit Cooling heating fan mode Startup stop during operation Operating con...

Page 54: ... Is LM wiring broken Is LM locked Check at the indoor unit side LM louver motor Is the louver operable with the remote control YES NO Does the louver operate at the power on YES NO YES NO Operate after waiting for more than 1 minute Repair wiring Defective indoor unit control PCB Replace Replace LM Normal Adjust LM lever and then check again 2 Error detection method 3 Condition of error displayed ...

Page 55: ...inal block of indoor unit NO YES NO Is AC380 415V for 3 phase unit detected between 1 2 and 3 on the teminal block of outdoor unit or isAC220 240V for 1 phase unit detected between 1 and 2 on the terminal block of outdoor unit YES Defective outdoor unit control PCB Noise filter Misconnection or breakage of connecting wires Defective indoor unit control PCB Replace Replace FM LM etc Replace fuse De...

Page 56: ...red voltage between X and Y in the indoor terminal block exceed 15 VDC YES NO YES NO NO YES Does the voltage between X and Y in the indoor terminal block exceed 15 VDC Remove wire for the remote control Power source reset YES Correct Remote control wire breakage Replace remote control Malfunction by temporary noise Defective indoor unit control PCB Replace Remote control wire breakage Replace remo...

Page 57: ...t the connecting wire between the indoor and outdoor unit Power source reset NO YES YES NO NO NO NO NO YES YES YES Set one remote control for Master and the other for Slave Set SW1 on remote control PCB at Master Set address again SW2 on indoor unit control PCB Separate remote control wires from high voltage wires Defective indoor unit control PCB Replace Defective remote control Change 2 Error de...

Page 58: ...0 minutes after the power on with remote control 3 Condition of error displayed Same as above 4 Presumable cause Improper setting Surrounding environment Defective remote control communication circuit Faulty indoor unit control PCB Faulty outdoor unit control PCB Note If any error is detected 30 minutes after displaying WAIT on the remote control the display changes to INSPECT I U NO NO NO NO NO A...

Page 59: ...tected between on the indoor unit terminal block NO YES WAIT See next page YES YES YES YES YES YES YES YES Defective outdoor unit PCB Replace Connect properly Replace fuse Defective indoor unit control PCB Replace Replace indoor unit control PCB Defective remote control Replace Broken remote control wire Y Replace Correct connection wires between indoor and outdoor units Defective outdoor unit PCB...

Page 60: ...efore replacing the power source fuse Diagnosis Countermeasure Replace the outdoor unit PCB YES YES NO YES Replace the outdoor unit PCB NO Replace the reactor NO Isn t there a short circuit between phases of outdoor unit PCB Aren t there cracks or burning on the power transistor module or diode stack Isn t reactor the anomalous Replace fuse 2 Error detection method 3 Condition of error displayed 4...

Page 61: ...door unit flashing twice Are wires connected properly between the indoor and the outdoor units Is approx DC20V detected between on the outdoor unit terminal block NO Is approx DC20V detected between on the indoor unit terminal block NO NO 2 N YES YES YES YES YES Replace fuse Short circuit on remote control wire Defective remote control Defective indoor unit control PCB Replace Defective remote con...

Page 62: ...ctedatremotecontrolconnection terminals Is DC10V or higher detected on remote control wires if the remote control is removed Are wires connected properly between the indoor outdoor units NO Defective remote control Defective remote control Defective connecting wire Defective remote control wire Short circuit etc Defective indoor unit control PCB Replace 2 Error detection method 3 Condition of erro...

Page 63: ...g between indoor outdoor units Power source reset NO 1 Malfunction by noise Check peripheral environment Defective indoor unit control PCB Replace Move to E5 Communication error during operation check 2 Error detection method When normal communication between the remote control and the indoor unit is interrupted for more than 2 minutes Detectable only with the remote control 3 Condition of error d...

Page 64: ...lty connection or breakage of signal wires between indoor outdoor units YES NO YES NO YES NO In case that the outdoor unit red LED flashes 2 time Repair signal wires Repair signal wires To the diagnosis of WAIT Unit is normal Malfunction by temporary noise etc Defective outdoor unit PCB Defective network communication circuit Replace Unit is normal Malfunction by temporary noise etc 2 Error detect...

Page 65: ...ndoor heat exchanger temperature sensor Replace Defective indoor unit control PCB Replace Defective indoor heat exchanger temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected on the indoor heat exchanger temperature sensor Thi R1 R2 or R3 3 Condition of error displayed When the temperature sensor detects 50 C or lower for ...

Page 66: ...hort circuit Correct Connect connector Defective return air temperature sensor Replace Defective indoor unit control PCB Replace Defective return air temperature sensor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected by indoor return air temperature sensor Thi A 3 Condition of error displayed When the temperature sensor detects 50 C or ...

Page 67: ...ure too high Note 2 For characteristics of indoor heat exchanger temperature sensor see the error display E6 YES NO YES NO Error stop Reset Indoor heat exchanger temperature C 56 63 Wash Defective indoor heat exchanger temperature sensor connector Correct Defective indoor heat exchanger temperature sensor Check refrigerant system Adjust 2 Error detection method Indoor heat exchanger temperature se...

Page 68: ...clogged Is the drain pipe slop OK NO YES NO YES NO Check float switch Defective indoor unit control PCB Replace Defective indoor unit control PCB Replace Check option equipment Correct setting to Humidifier drain pump motor interlock Defective indoor unit control PCB Replace Check wiring of drain pump motor Correct Check drain pump motor 2 Error detection method Float switch is activated 3 Conditi...

Page 69: ...plicable model 5 Troubleshooting All models Diagnosis Countermeasure Aren t more than 17 indoor units connected to one remote control NO YES Defective remote control Replace Reduce to 16 or less units 2 Error detection method When it detects more than 17 of indoor units connected to one remote control 3 Condition of error displayed Same as above 4 Presumable cause Excessive number of indoor units ...

Page 70: ...ases of RC EX3A Menu Service setting IU settings Select IU In cases of RC E5 Return address No to IU using or button 2 Error detection method IU address has been set using the Master IU address set function of remote control 3 Condition of error displayed Same as above 4 Presumable cause Same as above Note Is Master IU address set function of remote control used E11 occurs YES IU IU IU R C In case...

Page 71: ...ce faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of indoor fan motor 3 Condition of error displayed When actual rotation speed of indoor fan motor drops to lower than 200min 1 for 30 seconds continuously the comp...

Page 72: ...on the indoor unit control PCB ON E19 occurs when the power ON NO YES Defective indoor unit control PCB Defective SW7 Replace Turn SW7 1 on the indoor unit control PCB OFF and reset the power 2 Error detection method After indoor operation check when the communication between indoor and outdoor unit is established and SW7 1 is still kept ON 3 Condition of error displayed Same as above 4 Presumable...

Page 73: ...or Check power voltage Replace faulty fan motor and indoor unit control PCB Replace fan motor If the error persists after replacing the fan motor replace the indoor unit control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of indoor fan motor 3 Condition of error displayed When the actual fan rotation speed does not reach to the speed of required speed 50 ...

Page 74: ...or stops After 3 minute delay the compressor starts again automatically but if this error occurs again within 60 minutes after the initial detection 4 Presumable cause Faulty connection of remote control temperature sensor Defective remote control temperature sensor Defective remote control PCB Note After 10 seconds has passed since remote control temperature sensor was switched from valid to inva...

Page 75: ...erature sensor Check unit side Isn t the air circulation of outdoor unit short circuited Are installation spaces adequate Isn t there any fouling or clogging on heat exchanger Control operation check Defective outdoor unit PCB Replace Excessive refrigerant amount Recharge refrigerant by weighing proper amount on a scale 2 Error detection method Anomalous stop Reset 53 51 63 56 Outdoor heat exchang...

Page 76: ...rge pipe temperature sensor Insufficient refrigerant amount Recharge refrigerant by weighing proper amount on a scale Control operation check Defective outdoor unit PCB Replace Check unit side Isn t filter clogged Are adequate indoor outdoor unit installation spaces Isn t there any short circuit of air Isn t there any fouling clogging on indoor heat exchanger 2 Error detection method For the error...

Page 77: ...or Defective outdoor heat exchanger temperature sensor Replace Defective outdoor unit PCB Replace Defective outdoor heat exchanger temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the outdoor heat exchanger temperature sensor 3 Condition of error displayed When the temperature sensor detects 55 C or lower for 20 seconds continuously w...

Page 78: ...nector Defective outdoor air temperature sensor Replace Defective outdoor unit PCB Replace Defective outdoor air temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on outdoor air temperature sensor 3 Condition of error displayed When the temperature sensor detects 55 C or lower for 5 seconds continuously within 2 minutes to 2 minutes 20 se...

Page 79: ...erature C Broken wire Short circuit Correct connector Defective discharge pipe temperature sensor Replace Defective outdoor unit PCB Replace Defective temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the discharge pipe temperature sensor 3 Condition of error displayed When the temperature sensor detects 25 C or lower for 5 seconds con...

Page 80: ...alous sound on the compressor YES YES YES Are the service valve gas side opened Open the service valve Defective outdoor unit PCB Replace Defective outdoor unit PCB Replace 2 Error detection method If the inverter output current value exceeds the setting value within 80 seconds after the compressor ON in the heating mode the compressor stops 3 Condition of error displayed If the output current of ...

Page 81: ...pen the valves Check refrigerant amount and refregerant circuit In case of transitional increase of high pressure and or test run several times restarting may recover it because liquid refrigerant migrated in the compresser is discharged from the compressor Replace compressor 2 Error detection method In order to prevent from overcurrent of inverter if the current exceeds the specifications it make...

Page 82: ... the filter clogged At heating does the indoor fan motor run Are the service valves fully opened Is the filter clogged Is there any liquid flooding Is the superheat within normal range Is the low pressure sensor and suction pipe temperature sensor normal Is there any anoumalous sound on the compressor YES YES From previous page Defective outdoor unit PCB Replace Defective outdoor unit PCB Replace ...

Page 83: ...unit PCB Replace 2 Error detection method Error is displayed if the converter voltage exceeds target voltage 3 times within 20 minutes Remote control may be set after 3 minute delay Error is displayed if the converter voltage is lower than DC210V 1 time within 5 seconds after power ON 3 Condition of error displayed Same as above 4 Presumable cause Defective outdoor unit PCB Dust on outdoor unit PC...

Page 84: ... temporary noise 2 Error detection method Detected by rotation speed of outdoor fan motor 3 Condition of error displayed When actual rotation speed of outdoor fan motor drops to 75min 1 or lower for 30 minutes continuously the compressor and the outdoor fan motor stop After 3 minute delay it starts again automatically but if this anomaly occurs 3 times within 60 minutes after the initial detection...

Page 85: ...or detection method 3 Condition of error displayed 4 Presumable cause Note If the power transistor primary current exceeds the setting value for 3 seconds the compressor stops Power transistor primary current Outdoor unit PCB anomaly Dust on outdoor unit PCB Blown F2 fuse Check soldered surfaces on the outdoor unit PCB for foreign matter like dust fouling etc Isn t F2 fuse 250V 20A blown Remove fo...

Page 86: ...igerant Defective indoor unit control PCB Replace Defective indoor heat exchanger return air temperature sensor input circuits 2 Error detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger Thi R and indoor return air Thi A 3 Condition of error displayed When the insufficient refrigerant amount is detected 3 times within 60 minut...

Page 87: ... as above Excessive refrigerant amount Indoor outdoor unit installation spaces Faulty compressor Defective outdoor air temperature sensor Defective outdoor unit PCB Diagnosis Countermeasure 2 Error detection method 3 Condition of error displayed 4 Presumable cause Note Is outdoor ventilation condition good Inspect outdoor air temperature sensor Is the refrigerant amount nomal Adjust the refrigeran...

Page 88: ...fective outdoor unit PCB Replace Repalce compressor 2 Error detection method If it fails to change over to the rotor detection operation of compressor motor 3 Condition of error displayed If compressor fails to startup for 42 times 4 Presumable cause Outdoor fan motor anomaly Outdoor unit PCB anomaly Anomalous power source voltage Improper refrigerant amount and refrigerant circuit Faulty compress...

Page 89: ... position 3 Condition of error displayed If it fails again to detect the rotor position after shifting to the compressor rotor position detection operation the compressor stops 4 Presumable cause Defective outdoor fan motor Defective outdoor unit PCB Anomalous power source voltage Improper refrigerant amount and refrigerant circuit Defective compressor motor bearing Note Insulation resistance The ...

Page 90: ...R WH 12 12 2 0A YE GN １ BK BK RD WH LM4 LM1 LM2 LM3 M M 1 M M 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 M M 1 M M BK 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 BK BK BK BK BK BK BK BK BK WH WH WH WH WH WH WH WH WH WH BL BL BL BL BL BL BL BL BL BL RD RD RD RD RD RD RD RD RD RD E1 F1 CNWO WH 1 3 5 YE GN RD 3 15A WH Power circuit Indoor unit PCB CNL BK 3 1 2 BK BK BK Option 1 2 volt free contact HS BK BK Remo...

Page 91: ...V2 BK 2 4 3 1 3 Option WH BK RD WH RD BK WH RD BK WH RD BK CNL1 WH CNL2 WH Prepare on site CNZ CNC For HA WH RD SW2 SW6 SW5 SW7 LED 2 LED 3 SW8 1 5 Section 1 1 shows electric circuit of motion sensor Option Notes 1 indicates wiring on site 2 See the wiring diagram of outdoor unit about the line between indoor unit and outdoor unit 3 Use twin core cord 0 3mm 2 at remote control line See spec sheet ...

Page 92: ...Power PCB Power circuit BL or BK BR or WH WH or BL OR or YE 1 BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 YE GN TB1 F1 3 15A L CNWR2 WH BK F2 3 15A Earth The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit 1 2 CNTA BL Remote operation input volt free contact 12 Prepare on site XR5 Remote operation input volt free contact FMi1 FS Float switch Indication lamp Red ...

Page 93: ...BK Prepare on site Power PCB Power circuit 1 Earth The line between 2 1 3 Power source line Signal line indoor unit and outdoor unit M 1 4 5 6 7 F4 2A CNM2 BK RD BL or BK BR or WH WH or BL OR or YE BL 3 1 WH CNW3 WH 1 2 WH RD YE GN 3 5 CNW0 WH 1 3 TB1 F1 5A YE GN 1 2 CNTA BL Remote operation input volt free contact 12 Prepare on site XR5 Remote operation input volt free contact FMi2 FS Float switc...

Page 94: ...ications are based on the assumption that a metal or plastic conduit is used with no more than three cables contained in a conduit and a voltage drop is 2 For an installation falling outside of these conditions please follow the national or regional electricity regulations The wire numbers include earth wire Yellow Green regulations 2 N M BK WH RD V W U PCB ASSY PCB1 M MS TRANSISTOR POWER POWER T ...

Page 95: ... valve Suction Muffler Discharge Compressor Check joint Check joint Check joint Accumulator Check valve Thermistor ThO R2 φ9 52 Gas line φ15 88 Liquid line Strainer Temperature sensor Return temp Thi A Temperature sensor Heat exchanger Thi R3 Temperature sensor Heat exchanger Thi R2 Heat exchanger Flare connecting Flare connecting Cooling cycle Heating cycle Accumulator Service valve Flare connect...

Page 96: ...STRIES THERMAL SYSTEMS LTD Because of our policy of continuous improvement we reserve the right to make changes in all specifications without notice C MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS LTD 16 5 Konan 2 chome Minato ku Tokyo 108 8215 Japan http www mhi mth co jp en ...