Gree U-Match 5 Series - 3.5 Failures Not Caused by Errors

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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Troubleshooting：
3.4.36 “PU” Charge Loop Error
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display PU
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.
Troubleshooting：
PU
Charge loop error
Normal protection
Replace the drive board
Grid voltage is too low ?
YES
NO