Panasonic CS-XE9PKUA - Manual (Page 72)

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15.4.18 F11 (4-way Valve Switching Failure)
Malfunction Decision Conditions
š When indoor heat exchanger is cold during heating (except deice) or when indoor heat exchanger is hot during
cooling and compressor operating, the 4-way valve is detected as malfunction.
Malfunction Caused
š Indoor heat exchanger (pipe) thermistor
š 4-way valve malfunction
Troubleshooting
* Check gas side pipe – for hot gas flow in cooling mode