Fujitsu AG * V09LAC Series Service Instruction page 48

Self - diagnosis function and Checking points
Error Indication
Wired remote
Operation Timer 10°C HEAT
controller
(RED) (GREEN) (ORANGE)
0.5 sec 0.5 sec
OFF
3 times 2 times
0.5 sec
OFF
3 times
0.5 sec
OFF
4 times
0.5 sec
OFF
8 times
0.5 sec 0.5 sec
OFF
4 times 2 times
Error
(Protection)
Discharge thermistor
The detection value of the discharge thermistor is either open or shorted.
error > Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
0C
[Diagnosis Point]
Outdoor heat
The detection value of the outdoor heat exchanger thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
exchanger thermistor
error
06
[Diagnosis Point]
Outdoor temperature
The detection value of the outdoor temperature thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
thermistor error
0A
[Diagnosis Point]
Compressor
The detection value of the compressor thermistor is either open or shorted
temperature
thermistor error
15
[Diagnosis Point]
MANUAL AUTO switch
MANUAL AUTO switch becomes ON for 30 consecutive seconds.
> It indicates the error but the operation continues.
error
[Diagnosis Point]
20
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
> Compressor, Outdoor Fan : OFF (It automatically releases when the normal value is detected.)
Check Thermistor resistance value (Refer to "Thermistor characteristics table").
Controller PCB defective
Check if forced auto switch is kept pressed.
Forced auto switch defective.
Controller PCB defective.
Diagnosis Method