“L5” Freeze Protection - Gree FGR25Pd/DNa-X Service Manual

Possible reason：
■Power supply conducting wire of wired controller is short circuited
■IDU mainboard is abnormal
■Mainboard of wired controller is abnormal
Troubleshooting:
3.1.11 "L5" Freeze protection
Error display: IDU wired controller and IDU receive light board will display
Error judgment condition and method:
Check IDU pipe temperature. When pipe temperature is too low, freeze protection will be activated
to prevent freezing damage of evaporator.
Possible reason：
■IDU filter and evaporator are dirty
■IDU motor is blocked
■Refrigerant amount is insufficient
■Ambient temperature of IDU and ODU is too low
Troubleshooting:
Duct type split Air conditioner Inverter Series
92