Tosot TW09HQ3D6D Service Manual page 51

3. High temperature and overload protection (E8)(AP1 below means control board of outdoor unit)
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.
E8 is displayed
ambient temperature is higher
If the radiating of indoor
and outdoor unit is good?
If the indoor and outdoor
fan are running normally?
Replace outdoor
mainboard
48
If the outdoor
Yes
than 53℃?
No
Yes
No
Yes
End
Normal protection, please
use it after improving the
outdoor ambient temperature
No
Improve the radiating environment
of unit (clean the heat exchanger
and remove surrounding obstacles)
No
Connect normally?
Yes
Fan capacitor is broken?
No
Motor is broken?
No
Replace mainboard
Unit restarts
Yes
normally
Unit restarts
Yes
normally
Adjust the
Yes
connection
Replace Fan
Yes
capacitor
Replace Motor
Yes
Installation and Maintenance
Service Manual