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CS-TZ20TKEW, CS-TZ25TKEW, CS-TZ35TKEW, CS-TZ42TKEW, CS-MTZ16TKE, CU-TZ20TKE, CU-TZ25TKE, CU-TZ35TKE, CU-TZ42TKE - Panasonic Air Conditioner Service Manual (repair manual). Page 117

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117 
18.4.20  F17 (Indoor Standby Units Freezing Abnormality) 
Malfunction Decision Conditions 
  When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor 
pipe temperature is below -1.0°C. 
 
Remark: 
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor 
unit and H39 to other indoor unit(s). 
 
Malfunction Caused 
  Wrong wiring connection 
 Faulty 
sensor 
  Faulty expansion valve 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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