114
Troubleshooting
1.1.6 Failure of Power Supply to Indoor Unit and Remote Control Switch
● Lights and LCD are not Indicated.
● Not Operated
If fuses are melted or a breaker is activated, investigate the cause of over current and take necessary actions.
Cause Check Item
Action
(Turn OFF Main Switch)
Measure voltage
by volt-meter.
Supply power.
Phenomenon
Short Circuit Supplied
between Wires
Melted Fuse or
Activation of
Breaker at
Power Supply
Power Failure or Power is Not ON
Check for any
uncovered part of wires.
Remove the cause
of short-circuit and
replace the fuse.
Short Circuit of
Wires to Earth
Remove the cause
of short-circuit and
replace the fuse.
Failure of Indoor Unit
Fan Motor
Measure resistance
between wires and
insulation resistance.
Replace the DC
module for indoor fan,
fan motor and fuse.
Failure of DC module
for Indoor Fan
Replace the DC
module for indoor
fan and fuse.
Replace the DC
module for indoor fan,
fan motor and fuse.
Replace the DC
module for indoor
fan and fuse.
Short Circuit Supplied
between Wires
Melted Fuse
at Control
Circuit
Check for any
uncovered part of wires.
Remove the cause
of short-circuit and
replace the fuse.
Short Circuit of
Control Circuit to Earth
Measure insulation
resistance.
Measure insulation
resistance.
Remove the cause
of short-circuit and
replace the fuse.
Failure of Indoor Unit
Fan Motor
Measure resistance
between wiring and
insulation resistance.
Failure of DC module
for Indoor Fan
Measure voltage
at secondary side.
Replace the transformer.Failure of Transformer at Indoor Unit Side
Connect the cable.
Replace cable or
repair it.
Disconnected Cable of Remote Control Switch
Insufficient Connection
or Incorrect Connection
of Indoor Unit PCB
Insufficient
Contacting at
Connectors of
Remote Control
Switch
Check connectors. Correctly connect them.
Insufficient Connection
or Incorrect Connection
of PCB in Remote
Control Switch
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