CS-MZ20UD3EA - Panasonic Air Conditioner Service Manual (repair manual). Page 90

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90 
16.4.22  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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