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Troubleshooting
SiBE12-933_A
210
Service Diagnosis
Troubleshooting
(R7152)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check supply voltage
Rated voltage?
YES
Check indoor unit also, because a communication circuit fault
may be caused by the problem related to the indoor unit.
Check varistor (V1) on the
outdoor unit PCB
Is it damaged?
Check fuse (FU1) on the outdoor
unit PCB
Does it have continuity?
Check thermal fuse on the
terminal board
Does it have continuity?
Check +5V and GND on the
outdoor unit PCB
Power on again
NO
YES
YES
Wait more than 10 sec.
5 V±0.5 V
YES
NO
YES
NO
NO Check terminal board connecting
wire for proper connection
Firmly connected?
NO
NO
Continued to the next page
(1)
Rectify the power supply.
Replace the varistor.
Replace the fuse.
YES
Replace thermal fuse on
the terminal board.
Reconnect properly.
Replace terminal board.
Replace thermal fuse on
the terminal board.
Replace outdoor unit PCB.