Diagnosing Problems Using Error Codes - Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions

[2] Diagnosing Problems Using Error Codes

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 dealer or servicer.
Diagnosing Problems Using Error Codes
Error
code *1
Error type
(PCB *2
RC
M-NET)
Unreset errors
0100
Power failure
4106
254
( )
Power supply fault
4106
( 255 )
Water flow drop
2613
Vacuum protection fault
1301
High pressure fault/Thermal relay (THR1) operation
1302
Low evaporation temperature fault
1104
Water supply cutoff (Water flow rate sensor)
2601
Secondary side water supply cutoff error
2601
2
( )
Outlet water temperature fault (low temp)
2138
Cause
(Installation/Setting error)
Some of the errors have not been reset.
Power failure occurred when the
operation switch is switched on.
• Outside temperature is below the
minimum usage temperature.
• Sudden frosting or heavy snow has
clogged the heat exchanger.
Water flow drop
Water circuit air entrainment, water
strainer clogged
GB-62
Cause
(Parts problems)
• Transmission power board fault
• Water flow control valve fault
• Pump fault
• Low-pressure sensor fault
• Suction refrigerant temperature
thermistor fault
• Electric expansion valve fault on the main
circuit
• Fan motor error/broken motor wire
• Refrigerant shortage (gas leakage)
• Electronic expansion valve fault
• High-pressure sensor fault
• Water flow control valve fault
• Pump fault
• Thermal relay (THR1) operation
• Low-pressure sensor fault
• Suction refrigerant temperature
thermistor fault
• Electric expansion valve fault on the main
circuit
• Fan motor error/broken motor wire
• Refrigerant shortage (gas leakage)
• Water flow control valve fault
• Pump fault
• Water flow rate sensor
Flow sensor fault, pump fault, motor-
operated valve fault, water flow rate control
valve fault
• Fan motor error/broken motor wire
• Refrigerant shortage (gas leakage)
Error reset *3
Unit
side Remote
(PCB)
Operation
SWS1
SW