CS-TZ60TKEW, CS-TZ71TKEW, CU-TZ60TKE, CU-TZ71TKE - Panasonic Air Conditioner Service Manual (repair manual). Page 110

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110 
18.4.19    F11 (4-way Valve Switching Failure) 
Malfunction Decision Conditions 
  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 
  Indoor heat exchanger (pipe) thermistor 
  4-way valve malfunction 
 
Troubleshooting 
 
 
 
* Check gas side pipe – for hot gas flow in cooling mode 
 
 
 
 
 
 
 
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