Panasonic WH-SDC07F3E5 / WH-SDC09F3E5 / WH-UD07FE5 / WH-UD09FE5 Service Manual ▷ View online
117
16.5.23
IPM Overheating (F22)
Malfunction Decision Conditions:
During operation of cooling and heating, when temperature 95°C is detected by the outdoor IPM temperature
sensor.
sensor.
Malfunction Caused:
1 Faulty outdoor unit fan motor.
2 Faulty outdoor unit PCB (main).
2 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 3 times in 30 minutes.
118
16.5.24
Output Over Current Detection (F23)
Malfunction Decision Conditions:
During operation of cooling and heating, when outdoor DC current is above 34 A is detected by the IPM DC Peak
sensing circuitry in the outdoor unit PCB (main).
sensing circuitry in the outdoor unit PCB (main).
Malfunction Caused:
1 Faulty outdoor unit PCB (main).
2 Faulty compressor.
2 Faulty compressor.
Abnormality Judgment:
Continue for 7 times.
119
16.5.25
Refrigeration Cycle Abnormality (F24)
Malfunction Decision Conditions:
1 During operation of cooling and heating, compressor frequency > Frated.
2 During operation of cooling and heating, running current: 0.65 A < I < 1.65 A.
3 During operation of cooling, water inlet temperature - indoor refrigerant liquid temperature < 5°C.
4 During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5°C.
2 During operation of cooling and heating, running current: 0.65 A < I < 1.65 A.
3 During operation of cooling, water inlet temperature - indoor refrigerant liquid temperature < 5°C.
4 During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5°C.
Malfunction Caused:
1 Faulty water inlet or indoor refrigerant liquid temperature sensors.
2 2/3 way valve closed.
3 Refrigerant shortage (refrigerant leakage).
4 Clogged expansion valve or strainer.
5 Faulty outdoor unit PCB (main).
6 Poor compression of compressor.
2 2/3 way valve closed.
3 Refrigerant shortage (refrigerant leakage).
4 Clogged expansion valve or strainer.
5 Faulty outdoor unit PCB (main).
6 Poor compression of compressor.
Abnormality Judgment:
Continue 2 times in 20 minutes.
120
16.5.26
Four Way Valve Abnormality (F25)
Malfunction Decision Conditions:
1 During heating operation, when the indoor pipe temperature of thermostat ON indoor unit < 0°C.
2 During cooling operation, when the indoor pipe temperature of thermostat ON indoor unit > 45°C.
2 During cooling operation, when the indoor pipe temperature of thermostat ON indoor unit > 45°C.
Malfunction Caused:
1 Faulty sensor.
2 Faulty connector connection.
3 Faulty outdoor unit PCB (noise filter/main).
4 Faulty four way valve.
2 Faulty connector connection.
3 Faulty outdoor unit PCB (noise filter/main).
4 Faulty four way valve.
Abnormality Judgment:
Continue 4 times in 30 minutes.
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