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Si04-115
Trouble shooting
Service Diagnosis
79
5.13
Faulty Outdoor Unit PCB
Remote
Controller
Display
∗
Outdoor unit LED
Display
A
4
Method of
Malfunction
Detection
The proper program operation of the microcomputer is checked by the program.
Malfunction
Decision
Conditions
When the microcomputer program does not function properly.
Supposed
Causes
"
Microcomputer program run-away due to an external factor.
∗
Noise
∗
Momentary voltage drop
∗
Momentary power failure, etc.
"
Faulty outdoor unit PCB.
Troubleshooting
Turn on the power again.
Check the grounding.
YES
YES
Replace the outdoor unit PCB.
Provide proper grounding.
The malfunction may be
caused by an external factor,
rather than defective parts.
Locate the cause of the noise,
etc., and correct the situation.
Does the same LED
indication appear
again?
NO
NO
(R1957)
Is the grounding proper?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.