74
Installation and Maintenance
Service Manual
3. High temperature and overload protection (E8)(AP1 below means control board of outdoor unit)
Main detection points:
(1) outdoor temperature (2) fan (3)air inlet and air outlet of indoor/outdoor unit
Malfunction diagnosis process:
Y
N
Y
N
Y
N
high temperature
prevention protection
Is the outdoor ambient temperature
higher than 53℃？
Normal protection. Please operate
it when the outdoor ambient
temperature is improved.
Is the radiation of indoor unit
After the complete unit is disconnected
from the power for 20mins
and outdoor unit is not good?
Improve the unit's
radiation environment.
Check whether the fan terminal
OFAN is connected well;
Check whether the outdoor
Measure any two terminal with
the ohmmeter and resistance is less
than 1000ohm.
fan operates normally?
Replace the fan capacitor C1
Replace the outdoor fan
Replace the control board
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