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11-5. Judgment of Trouble by Every Symptom
11-5-1. Indoor Unit (Including Remote Controller)
(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?
Turn off power
supply once, and 5
second later, turn it
on again.
NO
Is OPERATION
lamp blinking?
Is it possible to
turn on power
supply by
pressing [
button on remote
Is fuse (F01) of
YES
indoor control
board blown?
NO
Is the
voltage
NO
across C08
measured
DC 310V~340V?
YES
Are DC 5V,
DC 12V
NO
supplied to
main P.C.
board?
YES
• Be sure to disconnect the motor connector CN210 after shut off the power supply, or it will be a cause of
damage of the motor.
YES
transmission
transmission
NO
remote control
remote control
flash normally,
flash normally,
]
and is its signal
and is its signal
transmitted
transmitted
control?
YES
Parts (R01, R03,
R04, DB01, C01,
C08, IC01, and
T01) are
defective.
Parts of power
supply circuit are
defective
Does
Does
mark on
mark on
NO
Remote control is
properly?
properly?
YES
"Troubleshooting for
Does fan
motor
connector
between 1
and 4 short-
circuit?
NO
Microcomputer
is defective.
Parts are
defective
– 67 –
Operation
Check item
Conceivable
principle cause
Measure
Item by symptoms
defective.
Refer to (4)
Remote Control."
Unit operates
YES
Replace main P.C.
board.
Replace motor
normally.
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