Panasonic S-22KA1E5S Service Manual page 212

18.2.11 Low Pressure Protection (F31-01)
Malfunction Decision Conditions
•
During operation of cooling and heating, when the outdoor unit low pressure sensor saturated temperature value
detected < 45°C.
Malfunction Caused
•
Clogged air filter of indoor unit.
•
Dust accumulation on the indoor/outdoor unit heat exchanger.
•
Air short circuit at indoor/outdoor unit.
•
3 way valve closed.
•
Faulty outdoor unit fan motor.
•
Refrigerant shortage (refrigerant leakage).
•
Clogged expansion valve or strainer.
•
Faulty outdoor unit low pressure switch.
•
Faulty outdoor unit PCB (main).
Abnormality Judgment
•
Continue 7 times in 60 minutes.
Troubleshooting
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