Specifications

Troubleshooting Si01-406
94 Service Diagnosis
4.6 Indoor Unit PCB Abnormality
Remote
Controller
Display
∗
Method of
Malfunction
Detection
The proper programme operation of the microcomputer is checked by the programme.
Malfunction
Decision
Conditions
When the microcomputer programme does not function properly.
Supposed
Causes

Microcomputer programme is in abnormal condition due to an external factor.
*Noise
*Momentary voltage drop.
*Momentary power failure, etc.

Faulty indoor unit PCB.
Troubleshooting
Turn on the power again.
YES
Replace the indoor 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?
Is the grounding proper?
(R1881)
NO
Check the grounding. (earth)
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.