GREE DC INVERTER HEAT PUMP CONDENSING UNIT
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■The switch power of drive board is abnormal, therefore, the 3.3V power voltage is abnormal.
■Communication circuit of the drive board or the master control board is abnormal.
Troubleshooting
：
3.4.18 “P7” Driver Module Sensor Error
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
If IPM or PFC module temperature is lower than the set protection value, then it can be judged that driver
module sensor error occurs and system will shut down for protection.
Possible reason:
■Module temperature sensor is short-circuited or broken-circuited.
■Drive board current sampling circuit element is damaged or drive chip current sampling AD terminal is
abnormal.
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