Gree FLEXX Series

GREE DC INVERTER HEAT PUMP CONDENSING UNIT
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3.4.23 “PH” Bus High-Voltage Protection
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
If there is no other malfunction and the busbar voltage is higher than the set value for high voltage protection,
then it can be judged that bus high-voltage protection occurs. System will shut down for protection.
Possible reason:
■Voltage of power grid is abnormal.
■Drive board busbar voltage sampling circuit element is damaged or drive board busbar voltage sampling AD
terminal is abnormal.
Troubleshooting
：
3.4.24 “PU” Charge Loop Error
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
When the charge loop starts to get charged and the busbar voltage cannot reach the set value in a certain
period of time, then it can be judged that charge loop error exists. System will shut down for protection.
Possible reason:
■Voltage of power grid is abnormal. Voltage is too low.
■Drive board charge loop element is abnormal.
■Drive board busbar voltage sampling circuit element is damaged or drive chip busbar voltage sampling AD
terminal is abnormal.