GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
50
Troubleshooting
：
PC Current detection
(or current sensor)
circuit error
Replace the drive
board.
3.4.24 “H7” Compressor out-of-step protection
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
During operation, it can’t detect the rotor position and stops output. Or the actual running speed differs too
much from the set running speed. In each case, compressor runs out of step and system stops for protection.
Possible reason:
■Compressor 3-phase wire connection is lack of phase or phased-reversed.
■Compressor phase wire connection is bad.
■System is blocked, short of refrigerant or compressor oil.
■Drive board IPM module is damaged.
■Drive board compressor current sampling circuit element is damaged or drive chip current sampling AD
terminal is abnormal.
■Compressor is damaged.
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