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(4) Diagnosis for anti-high temperature overload protection (AP1 below is control board of outdoor unit)
Main detection point:
If the outdoor ambient temperature is in normal range;
If the indoor and outdoor fan is running normal;
If the radiating environment of indoor and outdoor unit is well.
Malfunction diagnosis process:
Anti-high temperature
overload protection
If the outdoor ambient temperature is
higher than 53 ºC?
N
After the unit de-
energized for 20min
If the radiating of outdoor
and indoor unit is well?
N
If the outdoor fan work
well?
Y
Replace
control board
AP1
Finish
Normal protection, please use
Y
it after improve the outdoor
ambient temperature
Improve the
radiating
Y
environment of
unit
1. Check if fan terminal
OFAN is connected well
N
2. Test if resistance value
of any two terminals is less
than 1k
with ohmic meter
Replace fan
capacity C1
Replace
fan motor
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