Gree GUD24W2/D-D(U) - Page 60

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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3.4.31 “AE” Outdoor fan current detection circuit error
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
After power charging, if offset voltage average is detected to exceed 12.5% of 1.65V in 1s, then it can be
judged that current detection (or current sensor) circuit is faulted. System will shut down for protection.
Possible reason:
■Current detection (or current sensor) sampling circuit element is abnormal.
■Drive chip compressor current sampling AD terminal is badly welded or short-circuited.
Troubleshooting
：
3.4.32 “AJ” Outdoor fan 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, outdoor fan runs out of step and system stops for protection.
Possible reason:
■Outdoor fan 3-phase wire connection is lack of phase or phased-reversed.
■Outdoor fan phase wire connection is bad.
■System is blocked, short of refrigerant or compressor oil.
■Drive board IPM module is damaged.