Gree GUD50ZD/A-T

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
47
Troubleshooting：
3.4.7 ―E9‖ Water Overflow Protection
Error display: IDU wired control and IDU receiver light board will display E9
Error judgment condition and method:
Check the status of IDU float switch. When water level is too high, float switch is activated, so water full protection happens.
Possible reason:
■IDU is installed improperly
■Drainage pump is broken
■Float switch operates abnormally
■IDU mainboard is abnormal;