GREE U-Match 6 SERIES UNIT SERVICE MANUAL
75
Troubleshooting:
PL
Bus low
-voltage protection
Grid voltage is normal or not ?
Normal
protection
Replace the dr ive
board .
YES
NO
3.4.20 “PH” Bus High-Voltage Protection
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display PH
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:
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