50
Installation and Maintenance
Service Manual
(3)High temperature and overload protection diagnosis (AP1 hereinafter refers to the control board of the outdoor unit)
Mainly detect:
Is outdoor ambient temperature in normal range?
Are the outdoor and indoor fans operating normally?
Is the heat dissipation environment inside and outside the unit is good?
Fault diagnosis process:
End
Y
Y
N
Y
N
N
Y
N
Overheat and high
temperature protection
Is outdoor ambient temperature higher than 53?
20 minutes after the complete
unit is powered off.
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
Normal protection, please operate
it after the outdoor ambient temp-
erature is normalized.
Improve the heat
dissipation environ-
ment of the unit
Does the outdoor fan work normally?
1. Check if the fan terminal OFAN
is connected correctly
2. Pull out needle stand of fan, and use
ohm's meter to measure the resistance
between any two termunals of the fan.
The resistance is lower than 1KOhm.
Replace the
control panel
AP1
Replace the
outdoor fan
