Gree GUD50T/A-T Service Manual

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
70
Troubleshooting：
PL Bus low-voltage protection
Grid voltage is normal or not ?
Normal
protection
Replace the dr ive
board.
YES
NO
3.4.35 ―PH‖ Bus High-Voltage Protection
Error display: ODU mainboard, IDU wired control 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：
PH Bus high-voltage
protection
Grid voltage is normal or not ?
Normal
protection
Replace the dr ive
board .
YES
NO

Gree GUD50T/A-T Specifications

General

Brand	Gree
Model	GUD50T/A-T
Category	Air Conditioner
Language	English