Diagnosing Problems Using Error Codes - Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual

[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)
Unreset errors
A000
Power failure
4106
A-P0
Water supply cutoff
2501
(Flow switch has been triggered.)
AFSA
High pressure fault
1302
AHP1
Compressor flooding
1502
AdSH
Suction pressure fault
1505
Shell temperature fault
1103
Ther- Outside temperature (TH9)
5109
mistor
Inlet water temperature (TH10)
5116
fault
Outlet water temperature (TH11)
5111
Shell temperature (TH3)
5103
Discharge temperature (TH1)
5101
Suction temperature (TH2)
5102
Air-side heat exchanger inlet
5104
temperature (TH4)
External water temperature (TH14)
5114
External water temperature (TH15)
5115
Water-side heat exchanger refrigerant
5121
temperature thermistor error (TH21)
High-pressure sensor fault/high-pressure fault
5201
Low-pressure sensor fault/low-pressure fault
5202
Model setting error 1
7113
Model setting error 2
7117
Power supply frequency fault
4115
Open phase
4102
A471
Power supply fault
4106
255
( )
Cause
(Installation/Setting error)
*4 Some of the errors have not been
reset.
*5 Power failure occurred when the
operation 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-side 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.
Power supply problem
• There is an open phase.
• Power supply voltage drop
53
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
• Low-pressure sensor fault
• Air-side heat exchanger inlet
thermistor fault
• Suction refrigerant temperature
thermistor 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 thermistor wiring
• Broken or shorted pressure sensor
wiring
• Broken or shorted pressure sensor
wiring
• Resistor Z22, 24 or 25 fault
(connected to the Main control board)
• Circuit board fault
• Wiring fault
• Transmission power supply PCB fault
Error reset *3
Unit
Preliminary
side Remote
(PCB)
code
Operation
SWS1
SW