(5) Symptoms and parts to inspect
1) Symptom: LCD on the remote controller does not display and remote controller does
not operate.
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Start
Replace the
indoor unit PCB.
Is there 12 V DC
between 2 and 3
of the remote
controller?
Replace the
remote controller.
Repair the
remote
controller
wiring.
Check and repair the
power breaker etc.
Is the 220-240 V AC
circuit shorted?
Replace or repair.
Is the primary
side of the indoor
power transformer
shorted?
Are the connections
for the 4P connector
for the indoor unitÕs
PCB power trans-
former good?
Miswiring of
power supply
wires and
indoor/outdoor
control lines
Correct the
connections
Replace the
indoor unit power
transformer.
Correct the
wiring. Remove the
socket connected to
the OC plug on the
PCB and connect to
the EMG plug instead.
0332_M_I
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