8.1.3 Abnormal transmission between the remote control switch and the indoor unit
• RUN LED on the remote control switch:
Flickering every 2 seconds.
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Disconnection or insufficient contacting of the remote control cable
Check the cable and the
connections
Repair the cable or connect the
cable
Failure of the remote control switch
Check the remote control switch by
means of the self-check mode *1)
Replace the remote control switch if
the remote control switch is faulty
Failure of PCB (in the indoor unit
and the remote control switch)
Disconnected wire to PCB Check the connectors Correctly connect the wires
Failure of PCB
Check PCB by means of the self-
check mode *2)
Replace PCB if it failed
N O T E
• *1): Refer to section Self-checking of the remote control switch, see on page 301.
• *2): Refer to section Self-checking procedure of PCB by means of the Remote Control Switch, see on page
299.
8.1.4 Abnormal operation of the devices
Phenomenon
Cause Check item
Action
(Turn OFF the main switch)
RUN LED is ON and the
LCD is indicated.
However, the system
does not operate (For
example, the indoor fan,
the outdoor fan or the
compressor does not
operate)
Failure of the indoor unit
fan motor
Disconnected coil
Measure the coil resistance by
means of the tester
Replace the Indoor unit fan motor
Burnt-out coil
Measure the insulation
resistance
Failure of the outdoor
unit fan motor
Disconnected coil
Measure the coil resistance by
means of the tester
Replace the outdoor unit fan
motor
Burnt-out coil
Measure the insulation
resistance
Failure of the magnetic
switch for the outdoor
unit fan motor
Insufficient contacting
Measure the voltage between
the contacting parts
Replace PCB for the outdoor unit
Failure of the comp. motor
Measure the resistance between
two wires
Replace the compressor
Failure of the comp.
Check for an abnormal sound
from the Comp.
Failure of the magnetic
switch for comp.
Insufficient contacting
Check that the magnetic switch
activates correctly or not
Replace the magnetic switch
Failure of one of PCBs
Disconnected wiring to
PCB
Check the connections Correctly connect the wiring
Failure of PCB
Check PCB by means of the self-
check mode *1)
Replace PCB if it failed
8 Troubleshooting
198
SMGB0060 rev. 1- 12/2010
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