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FILE NO. SVM-01010
9-6. Troubleshooting for Indoor Unit
9-6-1. Power can not be turned on. (The unit does not operate at all.)
<Primary check>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
(3) Are the connection of the primary side and the secondary side
of the power transformer inserted into the P.C. board?
(4) Is the fuse (F01) blown?
Turn off power
supply once, and 5
second later, turn it
on again.
Is OPERATION
lamp blinking?
NO
YES
NO
NO
YES
YES
Is it possible to
turn on power
supply by
pressing
[START/STOP]
button on
remote control?
Does
transmission
mark on
remote control
flash normally,
and is its signal
transmitted
properly?
Remote control is
defective.
Refer to 9-9
“Troubleshooting for
Remote Control.”
Parts (R21,
R22, SG01,
C15, C01, DB01,
C02, IC01
and T01) are
defective.
Is fuse (F01)
of indoor control
board blown?
Is voltage
(DC 12V or 5V)
indicated on
rear of indoor
control board
normal?
Microcomputer
is defective.
Replace main
P.C. board.
Refer to
<Primary check>
or this praoblem
is one step short
of power P.C.
board block.
Is DC
310 – 340V
suppalied to
primary side of
transfer switch?
Are DC 15V,
DC 12V and
DC 7V
supplied to
secondary
side of
transfer
switch?
Turn off breaker
once and turn it on
againa after
removing motor.
Transfer switch,
IC (IC01) for
power supply or
fan motor is
defective.
Replace motor.
YES
YESNO
NO
NO
NO
YES
YES YES
NO
NO
YES
Does the fan
motor
connector
between 1
and 2
short-circuit?
Unit operates
normally.
Operation
Measure
Item by symptoms
Check item
Conceivable principle
cause
Are DC 15V,
DC 12V and
DC 7V
supplied to
secondary
side of
transfer
switch?
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