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Troubleshooting; Diagnosing Problems Using Error Codes - Mitsubishi Electric CAHV-P500YA-HPB Instruction Manual

Air-cooled heat pump unit cahv series
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3.

Troubleshooting

If a problem occurs, please check the following before calling for service.
(1) Check the error code against the table below.
(2) Check for possible causes of problems listed in the "Cause" column that correspond to the error code.
(3) If the error codes that appear on the display are not listed in the table below, or no problems were found with the items
listed in the "Cause" column, please consult your maintenance provider.
[1]

Diagnosing Problems Using Error Codes

Error
code *1
(PCB *2)
A000
Unreset errors
Power failure
A-P0
Water supply cutoff
AFSA
(Flow switch has been triggered.)
High pressure fault
AHP1
Compressor flooding
AdSH
Suction pressure fault
1303
Shell temperature fault
1103
5109
Ther-
Outside temperature (TH9)
mistor
5110
Inlet water temperature (TH10 MAIN Circuit)
fault
5112
Inlet water temperature (TH12 SUB Circuit)
5111
Outlet water temperature (TH11 MAIN Circuit)
5113
Outlet water temperature (TH13 SUB Circuit)
5103
Shell temperature (TH3 MAIN Circuit)
5107
Shell temperature (TH7 SUB Circuit)
5101
Discharge temperature (TH1 MAIN Circuit)
5105
Discharge temperature (TH5 SUB Circuit)
5102
Inlet temperature (TH2 MAIN Circuit)
5106
Inlet temperature (TH6 SUB Circuit)
Air-refrigerant heat exchanger inlet temperature
5104
(TH4 MAIN Circuit)
5108
Air-refrigerant heat exchanger inlet temperature
(TH8 SUB Circuit)
5114
Representative water temperature (TH14)
5115
Representative water temperature (TH15)
5117
High-pressure sensor fault/high-pressure fault
5118
Low-pressure sensor fault/low-pressure fault
Model setting error 1
7113
Model setting error 2
7117
Power supply frequency fault
4115
A471
Open phase
4106
Power supply fault
255
(
)
4121
Active filter fault
Discharge temperature fault
(A discharge refrigerant temperature of 120ºC or above is
AC61
detected for 30 seconds while the compressor is in operation.)
(Preliminary
(A discharge refrigerant temperature of 125ºC or above is
AC71
)
detected momentarily while the compressor is in operation.)
Error type
*4 Some of the errors have not been reset.
*5 Power failure occurred when the operation
Cause
(Installation/Setting error)
switch is switched on.
The water flow rate dropped below the flow
switch threshold.
Water supply cutoff
No water
Water supply cutoff
The outside temperature was below the
operating range.
Sudden frosting or heavy snow clogged up
the air-refrigerant heat exchanger.
The outside temperature was above the
upper limit of the operating range.
Excessive oil flow
Dip switches on the PCB were set
incorrectly during maintenance.
Power supply frequency is a frequency
other than 50 Hz or 60 Hz.
There is an open phase.
No water
Abrupt change in water temperature
(5K/min. or greater)
Pump failure
9/20
Cause
(Parts problems)
Open-circuited flow switch
Broken flow switch wiring
Linear expansion valve fault
High-pressure sensor fault
Fan motor fault/broken fan motor wiring
Low-pressure sensor fault
Shell temperature thermistor fault
High-pressure sensor fault
Discharge refrigerant temperature
thermistor fault
Linear expansion valve fault
Hot gas solenoid valve fault
Low-pressure sensor fault
Air-refrigerant heat exchanger inlet
thermistor fault
Suction refrigerant temperature
thermistor fault
LEV bypass check valve fault
Linear expansion valve fault
Fan motor fault/broken fan motor wiring
Refrigerant deficiency (refrigerant gas leak)
Shell temperature thermistor fault
Linear expansion valve fault
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted thermistor wiring
Broken or shorted pressure sensor wiring
Broken or shorted pressure sensor wiring
Resistor R21 fault (connected to the
Main control board)
Circuit board fault
Transmission power supply PCB
fault
Active filter fault
High-pressure sensor fault
Linear expansion valve fault (Main
circuit LEV, injection LEV)
Injection solenoid valve fault
Refrigerant deficiency (refrigerant
gas leak)
Error reset *3
Unit
side
Remote
(PCB)
Operation
SWS1
SW

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