Mitsubishi Electric e Series Service Handbook page 124

[ IX Troubleshooting ]
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
Error type
code *1
Power supply fault
4106
Water supply cutoff
2503
(Flow switch has been triggered.)
Water supply cutoff (detection by sensor)
101, 201: Upper side
2501
102, 202: Lower side
203: Inlet/outlet of unit
High pressure fault
1302
101: MAIN circuit
1303
102: SUB circuit
Discharge SH fault
101: MAIN circuit
102: SUB circuit
1176
Low pressure fault
101: MAIN circuit
102: SUB circuit
1301
ACC inlet SH fault
101: MAIN circuit
1189
102: SUB circuit
5109 Ther- Outdoor temperature (TH9)
mistor
5110 Inlet water temperature (TH10)
fault
5111
Inlet water temperature (TH11)
5112 Outlet water temperature (TH12)
5107 ACC inlet refrigerant temperature
(TH7, 8/TH107, 108)
5108
5103 Air heat exchanger refrigerant temperature
(TH3, 103/TH4, 104)
5104
5105 Water heat exchanger refrigerant
temperature (TH5, 105/TH6, 106)
5106
Discharge refrigerant temperature
5101
(TH1, 101/TH2, 102)
5102
101: Sensor error
102: Installation error
5116 External water sensor 2 fault (TH116)
5117 External water sensor 1 fault (TH117)
High-pressure sensor fault/high-pressure fault
5201
101: MAIN circuit
102: SUB circuit
Low-pressure sensor fault/low-pressure fault
5202
101: MAIN circuit
102: SUB circuit
7102 Connection count error
M o d e s l e t t n i g e r r r o 1
7113
Model setting error 2
7117
4102
O p e n p h a s e
HWE20010
Cause
(Installation/Setting error)
*3 Power supply fault 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
No water
Water supply cutoff
-
The outdoor temperature was below
the operating range.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Dip switches on the PCB were set
incorrectly during maintenance.
-
There is an open phase.
- 115 -
Cause
(Parts problems)
-
• Open-circuited flow switch
• Broken flow switch wiring
• Inlet water thermistor fault
• Outlet water thermistor fault
• Linear expansion valve fault
• High-pressure sensor fault
• Low-pressure sensor fault
• ACC inlet refrigerant temperature
thermistor fault
• High-pressure sensor fault
• Discharge refrigerant temperature
thermistor fault
• Linear expansion valve fault
• Low-pressure sensor fault
• ACC inlet refrigerant temperature
thermistor fault
• Linear expansion valve fault
• Refrigerant deficiency (refrigerant gas
leak)
• ACC inlet refrigerant temperature
thermistor fault
• Linear expansion valve fault
• Low-pressure sensor 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
• Setting of connection count fault
-
• CNTYP1 resistor fault (connected to the
Main control board)
• Circuit board fault
Error reset *2
Operation SW
Selector Remote
switch controller
GB