GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
214
2.2.4.100
“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:
2.2.4.101
“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
