Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 146

[ X Troubleshooting ]
2. Error code list
Error type
Unreset errors
Power failure
Water supply cutoff
(Flow switch has been triggered.)
High pressure fault
Compressor flooding
Suction pressure fault
Shell temperature fault
Ther- Discharge refrigerant temperature (TH1)
mistor
Suction refrigerant temperature (TH2)
fault
Shell temperature (TH3)
Air-side heat exchanger outlet
refrigerant temperature (TH4)
Outside temperature (TH9)
Inlet water temperature (TH10)
Outlet water temperature (TH11)
External water sensor temperature 1
(TH14)
External water sensor temperature 2
(TH15)
Water-side heat exchanger refrigerant
temperature thermistor error (TH21)
High-pressure sensor fault/high-pressure fault
Low-pressure sensor fault/low-pressure fault
Model setting error 1
Model setting error 2
Power supply frequency fault
Open phase
Power supply fault
HWE22020
Cause
(Installation/Setting error)
*6 Some of the errors have not
been reset.
*4 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
- 137 -
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 outlet
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
Error
Preliminary
side Remote
code *1
(PCB)
code
(PCB *2)
SWS1 Operation
A000
4106
A-P0
2501
AFSA
1302
AHP1
1502
AdSH
1505
1103
5101
5102
5103
5104
5109
5116
5111
5114
5115
5121
5201
5202
7113
7117
4115
4102
A471
4106
255
( )
SW
GB