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FILE NO. SVM-08032
9-5. Troubleshooting for Indoor unit
9-5-1. Power can not be turned on. (The unit does not operate at all.)
<Primar check>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
(3) 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
[ ]
button on remote
control?
Does
transmission
mark on
remote
control flash
normally, and
is its signal
transmitted
properly?
Remote control is
defective.
Refer to 9-8
Remote Control."
Parts (C25, C26,
SG01, DB01, R62,
R63, T01 and IC02
for 18SKPX,18SKPX-V
and 18SKP-E)
(C01, C02, SG01,
DB01, R09, R10, T01
and IC10 for 24SKPX
and 24SKP-E) are
defective.
Is fuse (F01)
of indoor
control board
blown?
Is voltage (DC
12V or 5V)
indicated on
rear of indoor
control board
normal?
Microconlroler
defective.
Replace main P.C.
board.
C27(for 18SKPX,
Are DC 12V,
across C32
Turn off breaker
once and turn it
on again after
removing motor.
T01 is defective.
Replace motor.
YES
YES
NO
NO
NO
NO
YES
YES
YES
NO
NO
YES
Does the fan
motor
connector
between 1
and
3 short-
circuit?
Unit operates
normally.
Operation
Measure
Item by symptoms
Check item
Conceivable principle
cause
"Troubleshooting for
18SKP-E)
C03 (for 24SKPX
and 24SKP-E)?
Is DC 310 -
340V across
(for 18SKPX,
18SKP-E)
and 24SKP-E)?
C27 (for 24SKPX
(for 18SKPX,
18SKPX-V and
and 24SKP-E)?
C27 (for 24SKPX
Are DC 12V,
across C32
18SKPX-V and
18SKPX-V and
18SKP-E)
