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FILE NO. SVM-03008
10-5. Judgment of Trouble by Every Symptom
10-5-1. Indoor unit (Including remote contro)
(1) Power is not turned on (Does not operate entirely)
<Primary check>
1. Is the supply voltage normal?
2. Is the normal voltage provided to the outdoor unit?
3. Is the crossover cable connected properly?
4. Is the fuse (F01) blown?
NO
Turn off power supply once, and
5 second later, turn it on again.
Is OPERATION lamp flashing?
Is it possible to turn on
power supply by pushing
[START/STOP] button
on remote control?
Is voltage
(DC12 V or 5 V)
indicated on rear of
indoor control
board normal?
Does transmission mark
on remote control flash
normally, and is its signal
transmitted properly?
Is DC310-340 V
supplied to
primary side of
transfer switch?
Are DC15 V, 12 V
and 7 V supplied to
secondary side of
transfer switch?
Are DC15 V, 12 V
and 7 V supplied to
secondary side of
transfeor switch?
Does fan
motor connector
between 1 and 2
short-circuit?
Item by symptoms
Operation
Check Item
Considerable principle cause
Measures
Parts (R01, R04, DB01, C01,
C03, IC01 and T01) are defective.
Remote control is defective.
Refer to (5) Troubleshooting
for remote control .
Turn off breaker once
and turn it on again
after removing motor.
Refer to <Primary check>
or this problem is one step
short of power P.C. board block.
Transfer swith,
IC (IC01) for
power supply or
fan motor is
defective.
Unit operates normally.
Replace main
P.C. board
Replace motor.
Is fuse (F01)
of indoor control
board blown?
Microcomputer
is defective.
NO
NO
NO
NO NO
NO NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
• Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of
damage of the motor.