Owner`s manual

22
Defective indoor unit heat exchanger thermistor
15
10
5
010 304020 50
5kΩ at 25˚C
Temperature (˚C)
Note (1) 22.5 kΩ at -6˚C
Return air thermistor (Th
I- A)
Indoor unit heat exchanger thermistor
(Th I- R)
Resistance temperature characteristics
Resistance (kΩ)
YES
YES
NO
NO
Is the indoor
unit heat exchanger
thermistor connector
connection OK?
Correction
Are characteristics
of indoor unit heat
exchanger thermistor OK
or is not there any
broken wire?
Defective indoor unit PCB Replace-
ment (Defective indoor unit heat
exchanger thermistor input circuit)
Defective indoor unit heat exchanger
thermistor Replacement
1
Indoor unit
Check Lamp (yellow) 1 time flash
Defective return air thermistor
YES YES
NO
NO
Is the return air
thermistor connector
connection OK?
Correction
Is the return air
thermistor characteristics
OK or is there a
broken wire?
Defective return air
thermistor Replacement
Defective indoor unit PCB
Replacement (Defective return air
thermistor input circuit)
2
Indoor unit
Check Lamp (yellow) 2 time flashes
Note (1) Characteristics as per the above graph.
YES
YES
YES
NO
Is there any
overflow?
NO
Is the float
switch tripper?
Note (1) Check if power source is there between DM connectors.
Is the angle of
drain piping good. Is there
any problem?
YES
NO
(1)
Is there output
for condensate motor
(DM)?
Defective indoor unit PCB Replace-
ment (Defective DM driving output cir-
cuit, defective float switch input cir-
cuit)
Repair or replace the
float switch
Defective indoor unit PCB Replace-
ment (Defective condensate motor output
circuit)
¡
Check DM broken wire, burning, locking.
¡Are there any DM connector loose.
¡Are there any PCB faston terminal loose.
¡Are there any DM wire broken.
Repair
Drain abnormality
3
Indoor unit
Check Lamp (yellow) 4 time flashes
(c) Inspection method when there are fault lamps (display lamps on indoor unit).
(i) Only case of wireless remote control model