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1.1.4 Failure of Power Supply to Indoor Unit and Remote Control Switch
G Lights and LCD are not Indicated.
G Not Operated
If fuses are melted or a breaker is activated, investigate the cause of over current and take
necessary action.
Phenomenon
Power Failure or Power is Not ON
Melted Fuse or
Activation of
Breaker at
Power Source
Melted Fuse
at Control
Circuit
Failure of Transformer at Indoor Unit Side
Disconnected Cable of Remote Control Switch
Insufficient Connection
or Incorrect Connection
Insufficient
of Indoor Unit PCB
Contacting at
Connectors of
Insufficient Connection
Remote Control
or Incorrect Connection
Switch
of PCB in Remote
Control Switch
Cause
Short Circuit Supplied
between Wires
Short Circuit of
Wires to Earth
Failure of Indoor Unit
Fan Motor
Failure of AC Chopper
for Indoor Fan
Short Circuit Supplied
between Wires
Short Circuit of
Control Circuit to Earth
Failure of Indoor Unit
Fan Motor
Failure of AC Chopper
for Indoor Fan
Check Item
Measure voltage
by volt-meter.
Check for any
uncovered part of wires.
Measure insulation
resistance.
Measure resistance
between wires and
insulation resistance.
Check for any
uncovered part of wires.
Measure insulation
resistance.
Measure resistance
between wiring and
insulation resistance.
Measure voltage
at secondary side.
Connect the cable.
Check connectors.
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Supply power.
Remove the cause
of short-circuit and
replace the fuse.
Remove the cause
of short-circuit and
replace the fuse.
Replace the AC
chopper for indoor fan,
fan motor and fuse.
Replace the AC
chopper for indoor
fan and fuse.
Remove the cause
of short-circuit and
replace the fuse.
Remove the cause
of short-circuit and
replace the fuse.
Replace the AC
chopper for indoor fan,
fan motor and fuse.
Replace the AC
chopper for indoor
fan and fuse.
Replace the transformer.
Replace cable or
repair it.
Correctly connect it.
1-7
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Troubleshooting
