Gree CM100N1320, Service Manual

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GREE GMV5 INDOOR UNIT SERVICE MANUAL
141
1.2.14
“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:
1.2.15
“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
■IDU motor is blocked
■Refrigerant amount is insufficient
■Ambient temperature of IDU and ODU is too low