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(7) Left/right louver performance fault
1
Louver motor fault
2
Disconnecting, breaking and contact fault of the con-
nector
1
Louver motor resistance value check
2
Check the removing of indoor controller
board (CNL) breaking line and contact
fault.
(8) Though the remote controller dis-
play is normal in cool mode, the
capacity is not enough.
1
Filter clogging (dirt)
2
Heat exchanger clogging (dirt)
3
Air duct short cycle
4
Refrigerant shortage
5
Operation failure in electronic expansion valve
6
Thermistor connection failure
7
Incorrect piping size
8
Piping is too long.
1
Open the grille to check the filter.
Clean the filter and remove dust or dirt
away.
2
Clean the heat exchanger.
Lowering the indoor piping temperature
and intake pressure means clogging in
the heat exchanger.
3
Remove screen in the air duct (air outlet/
intake).
4
Check if gas leaks or not in the piping
joint.
5
,
6
Check the refrigerant circuit operation
status.
7
Check the piping size.
8
Check the capacity loss characteristic for
the piping length.
(9) Though the remote controller dis-
play is normal in Heat mode, the
capacity is not enough.
1
Filter clogging (dirt)
2
Heat exchanger clogging (dirt)
3
Air duct short cycle
4
Refrigerant shortage
5
Outdoor unit bypass circuit failure
6
Indoor reverse check valve failure
Reverse check valve failure may cause refrigerant
leakage and restrictor failure.
7
Heat insulator of refrigerant pipes is defective.
8
Malfunction of LEV
9
Loose connection in thermistor
1
Open the grille to check the filter.
Clean the filter and remove dust or dirt
away.
2
Clean the heat exchanger.
Rising the indoor piping temperature and
outlet pressure means clogging in the
heat exchanger.
3
Remove screen in the air duct (air outlet/
intake).
4
Check if gas leaks or not in the piping
joint.
5
Operating condition check in the refriger-
ant cycle.
6
Since outlet temperature and indoor heat
exchanger temperature does not rise,
measure the outlet pressure and deter-
mine the countermeasure.
7
Check the heat insulator.
8
,
9
Check the function of refrigerant circuit.
Phenomena
Factor
Countermeasure
(6) Upward/downward vane perform-
ance fault
1
When the unit is as follows in the HEAT mode, the
vane is not downward.
(Working of COOL protection function)
• During HEAT preparation
• During defrosting
• During compressor stop
2
When setting the downward vane in the cool/dry
mode, the vane changes to Horizontal position after
1 hour
3
Vane motor does not rotate.
A) Vane motor fault
B) Disconnecting, breaking and contact fault of the
connector
C) Setting to no vane unit
4
Standard position reading fault (Vane motor does not
stop.)
A) Limited switch fault
B) Disconnecting breaking and contact fault of the
connector
Only AC timing motor adopting mode (No limited
switch for stepping motor adopting model)
1
Normal operation
2
Normal operation
3
A) Vane motor resistance value check
B) Disconnecting, breaking, and contact
fault of the connector
Stepping motor adopting model
....
CN6V
check
AC timing motor adopting model
....
CNV
check
C) Check the setting details by selecting
the remote controller function.
Setting check of the indoor controller
board J11~J15 (SW1).
4
A) Limited switch (LS) conductance check
B) Check the removing of indoor control-
ler board (CN23), breaking line and
contact fault.
OC379F
