Panasonic WH-MXC16G9E8 Service Manual ▷ View online
97
16.5.5 Service Valve Error (H27)
Malfunction Decision Conditions:
During cooling operation, when:-
[a] Indoor refrigerant pipe temperature at compressor startup - present indoor refrigerant pipe temperature < 2°C
[b] Present high pressure - high pressure at compressor startup < 5kg/cm²
**Judgment only for first time cooling operation and not during pump down operation.
[a] Indoor refrigerant pipe temperature at compressor startup - present indoor refrigerant pipe temperature < 2°C
[b] Present high pressure - high pressure at compressor startup < 5kg/cm²
**Judgment only for first time cooling operation and not during pump down operation.
Malfunction Caused:
1. 3 way valves closed.
2. Faulty high pressure sensor.
3. Faulty indoor refrigerant pipe temperature sensor
4. Faulty outdoor unit PCB (main).
2. Faulty high pressure sensor.
3. Faulty indoor refrigerant pipe temperature sensor
4. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 5 minutes.
98
16.5.6 Compressor Low Pressure Protection (H42)
Malfunction Decision Conditions:
During operation of heating and after 5 minutes compressor ON, when outdoor pipe temperature below -29°C or
above 26°C is detected by the outdoor pipe temperature sensor.
above 26°C is detected by the outdoor pipe temperature sensor.
Malfunction Caused:
1. Dust accumulation on the outdoor unit heat exchanger.
2. Air short circuit at outdoor unit.
3. 2 way valve partially closed.
4. Faulty outdoor unit fan motor.
5. Refrigerant shortage (refrigerant leakage).
6. Clogged expansion valve or strainer.
7. Faulty outdoor pipe temperature sensor.
8. Faulty outdoor unit main PCB (main).
2. Air short circuit at outdoor unit.
3. 2 way valve partially closed.
4. Faulty outdoor unit fan motor.
5. Refrigerant shortage (refrigerant leakage).
6. Clogged expansion valve or strainer.
7. Faulty outdoor pipe temperature sensor.
8. Faulty outdoor unit main PCB (main).
99
16.5.7 Water Flow Switch Abnormality (H62)
Malfunction Decision Conditions:
During operation of cooling and heating, the water flow detected by the indoor water flow switch is used to
determine water flow error.
determine water flow error.
Malfunction Caused:
1. Faulty water pump.
2. Water leak in system.
3. Faulty connector connection.
4. Faulty water flow switch.
5. Faulty indoor unit PCB (main).
2. Water leak in system.
3. Faulty connector connection.
4. Faulty water flow switch.
5. Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 10 seconds (but no judgment for 9 minutes after compressor startup/restart).
100
16.5.8 Outdoor High Pressure Abnormality (H64)
Malfunction Decision Conditions:
During operation of cooling and heating, when the outdoor high pressure sensor output signal is 0Vdc or 5Vdc.
Malfunction Caused:
1. Faulty connector connection.
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
2. Faulty sensor.
3. Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 20 minutes.
Click on the first or last page to see other WH-MXC16G9E8 service manuals if exist.