Panasonic CS-PS36RKV Service Manual page 55

14.4.16 F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions
During cooling, compressor frequency = Fcmax.
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During cooling and heating operation, running current: 0.78A < I < 1.15A.
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During cooling, indoor intake - indoor pipe < 4°C.
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Malfunction Caused
Refrigerant shortage (refrigerant leakage)
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Poor compression performance of compressor.
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2/3 way valve closed.
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Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
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Troubleshooting
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