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FILE NO. SVM-10020
11-5. Judgement of Trouble by Every Symptom
11-5-1. Indoor unit (Including remote controller)
(1) Indoor unit is not operated.
(2) Operation is not turned on though Indoor P.C. board is replaced
<Confirmation procedure>
NO
Turn off power supply once, and
5 second later, turn it on again.
Is OPERATION indicator flashing?
Is it possible to turn on
A/C by pushing
[ ] button
on remote controller?
Is voltage
(DC5V, 12V and 15V)
indicated on rear of
indoor control
board normal?
Does transmission mark
on remote controller flash
normally,and is its signal
transmitted properly?
Does fan
motor connector
between CN10 1 –
3 short-circuit?
Item by symptoms
Operation
Check Item
Considerable principle cause
Measures
Remote controller is defective.
Refer to (5) “Troubleshooting
for remote controller”.
Unit operates normally.
Replace main
P.C. board
Replace fan
motor.
Is fuse (F01)
of indoor control
board blown?
Microcomputer
is defective.
NO
NO
NO NO
NO
YES
YES
YES YES
YES
YES
Point remote to digital
camera. Can see infrared
ray at sending LED
when push [ ] button?
Replace remote control
Does connection
between PC Board
and reciver PCB
Reconnect housing
on camera monitor
YES
YES
are connect properly?
YES
NO
NO
To item of
“Indoor unit is not operated”.
Turn on power supply.
Does OPERATION indicator flash?
Is wired correctly to white and
black lead wires of terminal block?
NO
NO
YES
Correct wiring
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