GREE Multi Variable Air Conditioners Indoor Unit
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1.3.14 “L4” Power supply overcurrent protection
Error display: IDU wired controller and IDU receive light board will display
Error judgment condition and method:
Check if the power supply current from IDU to wired controller is normal. If power supply current is
too big, it is judged that the current is abnormal.
Possible reason:
Power supply conducting wire of wired controller is short circuited
IDU mainboard is abnormal
Mainboard of wired controller is abnormal
Troubleshooting:
1.3.15 “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
Refrigerant amount is insufficient
Ambient temperature of IDU and ODU is too low
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