CS-HE7QKD, CS-HE9QKD, CS-HE12QKD, CS-HE18QKD, CU-HE7QKD, CU-HE9QKD, CU-HE12QKD, CU-HE18QKD - Panasonic Air Conditioner Service Manual (repair manual). Page 103

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103 
15.4.23  F91 (Refrigeration Cycle Abnormality) 
Malfunction Decision Conditions 
  The input current is low while the compressor is running at higher than the setting frequency. 
 
Malfunction Caused 
  Lack of gas. 
  3-way valve close. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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