Panasonic WH-SXH09D0E8 Service Manual page 49

16.5.3 Indoor Refrigerant Liquid Temperature Sensor Abnormality (H23)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the indoor refrigerant liquid
temperature sensor are used to determine sensor error.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty sensor.
3 Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
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