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CS-TZ20TKEW-1, CS-TZ25TKEW-1, CS-TZ35TKEW-1, CU-TZ20TKE-1, CU-TZ25TKE-1, CU-TZ35TKE-1 - Panasonic Air Conditioner Service Manual (repair manual). Page 117

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117 
18.4.28    F99 (DC Peak Detection) 
Malfunction Decision Conditions 
During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal 
DC Peak sensing circuitry. 
 
Malfunction Caused 
  DC current peak due to compressor failure. 
  DC current peak due to defective power transistor(s). 
  DC current peak due to defective outdoor unit PCB. 
  DC current peak due to short circuit. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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