8.2 Procedure for troubleshooting
If RUN lamp flashes for 2 seconds, there is a failure in transmission between the indoor unit and the remote control switch.
Possible causes are:
• The remote cable is broken.
•
Contact failure in remote control cable.
• IC or microcomputer defective.
• In all cases, contact your service provider.
If RUN lamp flashes 5 times (5 seconds) with unit number and alarm code displayed, note the alarm code (see table Alarm
codes) and contact your service provider.
11
Alternate
indication
every second
Indoor unit
number
Alarm code
Model code
No. of indoor units
connected
Alarm code
8.2.1 Alarm codes
Code Category Content of abnormality Possible cause
01 Indoor unit Protection device activation (float switch)
Float switch activation (high water level in drain hose or
abnormality in drain pipe, float switch or drain pan).
02 Outdoor unit
Protection device activation (disconnection due to high
pressure)
PSH activation (pipe clogging, excess refrigerant, mixture of
inert gas).
03
Transmission
Abnormality between indoor and outdoor
Incorrect wiring, loose terminals, disconnect cable, blown fuse,
outdoor unit switched off.
04 Abnormality between inverter PCB and outdoor PCB
Inverter PCB - Outdoor PCB transmission fault (loose
connector, broken cable, blown fuse).
04. Abnormality between fan controller and outdoor PCB
Fan controller - Outdoor PCB transmission fault (loose
connector, broken cable, blown fuse).
05 Power phase Abnormality in the power phases
Incorrect power supply, inverted phase connection, open
phase.
06
Voltage
Abnormal inverter voltage Outdoor voltage drop, insufficient power.
06. Abnormal fan controller voltage Outdoor voltage drop, insufficient power.
07
Cycle
Drop in discharge gas superheat
Excessive refrigerant charge, thermistor fault, incorrect wiring,
incorrect pipe connection, expansion valve locked in open
position (connector disconnected).
08 Increase in discharge gas temperature
Insufficient refrigerant charge, pipe clogging, thermistor fault,
incorrect wiring, incorrect pipe connection, expansion valve
locked in closed position (connector disconnected).
0A Transmission Abnormality between outdoor and indoor Incorrect wiring, broken cable, loose terminals.
0b
Outdoor unit
Incorrect outdoor unit address setting
Duplicate address setting of outdoor units (secondary units) in
the same refrigerant cycle system.
0C Main unit of the outdoor unit incorrectly set
Two (or more) outdoor units defined as the “main unit” in the
same refrigerant cycle system.
11
Indoor unit
sensor
Air inlet thermistor
Incorrect wiring, disconnected wiring, broken cable, short
circuit.
12 Air outlet thermistor
13 Frost protection thermistor
14 Gas pipe thermistor
19 Fan motor Indoor fan protection device activation Fan motor overheating, locking.
8 Troubleshooting
168
SMGB0065 rev. 1 - 12/2010
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