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Check the indoor PCB: only indoor
charged measure the voltage
between 3 and 4 of IC6 on the indoor
PCB with a universal meter. And
measure the voltage between
CN23(S) and CN17 (L) with a
universal meter.
If the voltage is a constant
value from DC 0V to DC 5V.Or
the voltage between
communication line (red) and N
(white line) is not close to18V
DC when only indoor charged.
NO
Test the outdoor power is
supply 230VAC with a
universal meter when indoor
and outdoor are charged.
YES
LED2 light of the outdoor
YES
LED 1 light
YES
The indoor PCB is
damaged; replace it
with a new one.
NO
Check the cable
between
and power
NO
The module PCB is
damaged. Replace
it with a new one.
YES
Measure the voltage
between 3 and 4 of IC9 on
the Outdoor mainboard
with a universal meter .The
voltage is a constant value
of 0V DC to 5V DC
NO
Outdoor PCB is ok then check
cable.
44
outdoor
YES
Domestic Air Conditioner
Service Diagnosis
The outdoor PCB is
damaged. Replace
it with a new one.
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