CS-MZ20UD3EA - Panasonic Air Conditioner Service Manual (repair manual). Page 93

93 

  During operating of cooling and heating, when IPM temperature data (100°C) is detected by the IPM temperature 

sensor. 
Multi Models only 
o  Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated. 
o  Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is 

detected by the heat sink temperature sensor. 

  IPM overheats due to short circuit of hot discharge air flow. 

  IPM overheats due to defective of outdoor fan motor. 

  IPM overheats due to defective of internal circuitry of IPM. 

  IPM overheats due to defective IPM temperature sensor. 

Multi Models Only 
o  Compressor OL connector poor contact. 
o Compressor 

OL 

faulty. 

 
Troubleshooting