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Item by symptom
Operation
Check Item
Considerable main cause
Measures
Turn off the power supply
once, and turn on it again
after 5 seconds passed.
Does the operation
lamp flash?
Does send display
of remote controller flash
normally, and is the signal
sent securely?
(No trouble)
YES
Parts (R21, R109, SG01,
C15, C01, DB01, C02,
IC01, T01) are defective.
Is the power supply
turned on by pressing
[START/STOP] button
on remote controller?
NO
YES
YES
NONO
YES
NO
NO
NO
YES
YES
YES
NO
NO
Is fuse of indoor control
board blown? (F01)
Is temp. fuse blown?
Connection of connecting
wire is defective.
Is voltage indicated
on rear of indoor control
board (DC12V or 5V)
normal?
Is DC310 to 340V
applied to primary
side of SW trans.
(T01) applied?
Is DC35V,
DC12V, DC7V
applied to secondary
side of SW trans.
(T01) applied?
YES
Is DC35V,
DC12V, DC7V
applied to secondary
side of SW trans.
(T01) applied?
To item of Pre-check or
trouble before power board
Remote controller
error
Replace main
board.
Replace temp.
fuse set.
Check connecting
wire.
Microcomputer
is defective.
Turn “OFF” breaker
once, and “ON”
again after removing
motor.
SW trans.,
IC (IC01) for
power supply, ]
or fan motor
Motor is defective.
Refer to the item of
Remote controller
check. (p.49)
YES YES
NO NO
To item of “Power supply
is not turned on”.
Turn on power supply.
Does operation lamp flash?
Is wired correctly to white and black
lead wires of terminal block?
Correct wiring.
10-5. Judgment of Trouble by Every Symptom
10-5-1. Indoor Unit (Including Remote Controller)
(1) Power is not turned on (Does not operate entirely)
• 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.
(2) Power is not turned on though Indoor P.C. board is replaced
<Confirmation procedure>