Mitsubishi Electric CAHV-P500YB-HPB, Service Handbook

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[
IX
Troubleshooting ]
- 125 -
HWE15070 GB
*Preliminary error codes will not appear on the 7-segment LED.
Error Type
Cause
(problem with the installation environment/setting error)
Cause
(component problem)
Remote
SWS1
Operation SW
Power supply fault Active filter fault Heat exchanger freeze up Discharge temperature fault
*8 *7
4106
(Details : 255)
4121
(Preliminary : 4171)
AC61
(Preliminary AC71)
1104
Current-related problem during normal operation
IPM error
4250 4255
(Preliminary : 4350) (Preliminary : 4355)
(Details :
101)
4250 4255
(Preliminary : 4350) (Preliminary : 4355)
(Details :
102)
4250 4255
(Preliminary : 4350) (Preliminary : 4355)
(Details :
103)
4250 4255
(Preliminary : 4350) (Preliminary : 4355)
(Details :
107)
●After a power reset, if nomal power suppy is not detected five consecutive times at 20 ms intervals,this will be regarded as an error. ●A suction temperature of -2ºC or below has been detected for 10 seconds during the defrost cycle and 30 seconds after the initiation of the defrost cycle.
●Incorrect dip switch setting ●Incorrect SW2-4 setting
●Transmission power supply output fault
Wiring fault Detection of overcurrent in the transmission power supply
●Transmission power supply power reception fault
In a multiple unit system, one unit started supplying power, but the other units have not. Transmission power supply fault Transmission voltage detection circuit fault
●4-way valve switching failure ●High-pressure sensor fault ●Discharge refrigerant thermistor fault ●Linear expansion valve fault (Main circuit LEV, injection LEV) ●Injection solenoid valve fault ●Fan motor error ●Fan inverter fault ●Refrigerant shortage (gas leakage) ●Thermistor input circuit fault on the control board ●INV board fault ●Ground fault of the compressor or fan motor ●Coil fault on the compressor or fan motor ●IPM fault (loose terminal screws, cracks due to swelling) ●Items in the "Heatsink overheat protection" row in the "Cause" column. ●INV board fault ●Compressor ground fault ●Coil failure ●IPM fault (loose terminal screws, cracks due to swelling)
●Water depletion ●Abrupt water temperature change (5K/min or greater) ●Pump fault ●Drop in water flow or water outage during defrost ●
Water temperature drop during defrost
●30 seconds after the compressor has started up ●An overcurrent was detected by the overcurrent detection resistor (RSH) on the INV board. ●An IPM error signal was detected.
ACCT overcurrent
●30 seconds after the compressor has started up ●A peak current of at or above 56A or 33
Arms was detected by the current sensor.
DCCT overcurrent
●30 seconds after the compressor has started up ●A peak current of at or above 56A or 33
Arms was detected by the current sensor.
Overcurrent relay trip (effective value) (During normal operation)
●30 seconds after the compressor has started up ●A current of at or adove 33 Arms was detected by the current sensor.
●Preliminary : A discharge temperature of 120ºC or above has been detected for 30 seconds while the compressor is in operation. ●Error : The above preliminary error was detected three times. ●Error : A discharge temperature of 125ºC or above was detected momentarily.
Inverter fault
Error code
*1
(PCB
*2
RC M-NET)
Resetting the error
*3
Unit side
(PCB)
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