Gree GWH09RB-K3DNA3G Service Manual page 46

Service Manual
3. High temperature and overload protection (E8)(AP1 below means control board of outdoor unit) E8
Main detection points:
● If the outdoor ambient temperature is in normal range;
● If the indoor and outdoor fan are running normally;
● If the radiating environment of indoor and outdoor unit is good.
Malfunction diagnosis process:
ambient temperature is higher
If the radiating of indoor
and outdoor unit is good?
If the indoor and outdoor
fan are running normally?
Installation and Maintenance
E8 is displayed
If the outdoor
than 53℃?
N
N
Y
Replace outdoor
mainboard
End
Normal protection, please
Y use it after improving the
outdoor ambient temperature
N
Improve the radiating environment
of unit (clean the heat exchanger
Y
and remove surrounding obstacles)
N
Connect normally?
Y
Fan capacitor is broken?
N
Motor is broken?
N
Replace mainboard
Unit restarts
Y
normally
Unit restarts
Y
normally
Adjust the
Y
connection
Replace Fan
Y
capacitor
Replace Motor
Y
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