Lennox LI012CI-160P432-1 Service Manual page 70

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 good?
Fault diagnosis process:
Installation and Maintenance
Overheat and high
temperature protection
Is outdoor ambient temperature higher than 53?
N
20 minutes after the complete
unit is powered off.
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
N
Does the outdoor fan work normally?
Y
Replace the
control panel AP1
End
Normal protection, please operate
it after the outdoor ambient temp-
Y
erature is normalized.
Improve the heat
Y
dissipation environ-
ment of the unit
1. Check if the fan terminal OFAN
is connected correctly
2. Resistance between any two
N
terminals is measure by an ohm
gauge and should be less than 1K
Ohm.
Replace the fan
capacitor C1
Replace the
outdoor fan
67