Gree U-Match 5 Series - “E9” Water Overflow Protection

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4.7 “E9” Water Overflow Protection
Error display: IDU wired controller 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;
Troubleshooting：