97
(7)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 linear 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.
(8)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
(9)Operation failure of the outdoor fan
(Fan does not rotate.)
1
Defective outdoor fan motor
(Short or open of the winding)
2
Defective outdoor fan motor
(Rotating-position detecting circuit built in the motor
does not output any signals.)
3
Defective outdoor controller board
1
Check the resistance of winding.
Refer to “5, HOW TO CHECK THE PARTS”.
2
First of all, check the voltage of FAN12
and FAN22 on the outdoor controller
board. Check the voltage between pin
1 and 5, between pin 2 and 5, between
pin 3 and 5. If any of them does not
repeat the pattern “0V
➔
5V
➔
0V”, the
rotating-position detecting circuit is defective.
Replace the outdoor fan motor.
Second of all, make sure the voltage
between pin 4 and 5 is always 5V
I
0.2V.
If not, replace the outdoor controller board
and recheck the voltage.
3
Replace the outdoor controller board.
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