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 115

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18.4.18    H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) 

Error Code will not display (no Timer LED blinking) but store in EEPROM 
 
Malfunction Decision Conditions 
  Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C) 
 
Malfunction Caused 
  Air short circuit at indoor unit 
  Clogged indoor unit air filter 
  Dust accumulation on the indoor unit heat exchanger 
  2/3 way valve closed 
  Faulty indoor unit fan motor 
 Refrigerant 
shortage 
(refrigerant leakage) 
  Clogged expansion valve or strainer 
  Faulty indoor pipe temperature sensor 
  Faulty indoor unit PCB 
 
Troubleshooting 
 
 
 
 
 
 
 

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