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

Air-cooled heat pump unit cahv series

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Service handbook (161 pages)

Table of Contents

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

•