York EVHC 09 DSAAAR Service Manual page 49

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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?
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?
Does the outdoor fan work normally?
Replace the control panel
AP1
N
Y
N
N
Y
End
Normal protection, please operate it after the
Y
outdoor ambient temperature is normalized.
Improve the heat
dissipation environment
of the unit
1. Check if the fan terminal OFAN
is connected correctly
2. Resistance between any two
terminals is measure by an ohm
gauge and should be less than 1K
Ohm.
Replace the fan
capacitor C1
Replace the
outdoor fan
169