Fujitsu AS*9LSACW Service Instructions Manual page 53

0.5 sec 0.1 sec. Indoor Unit
2 times blinking Thermistor
Error
0.5 sec 0.1 sec. Outdoor Unit
3 times blinking Thermistor
Error
0.5 sec 0.1 sec. Indoor Unit
4 times blinking Controller
Error
0.1 0.5 sec Room temperature
sec. 2 times thermistor defective
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0.1 0.5 sec Indoor Heat Exchanger
sec. 3 times Thermistor Error
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0.1 0.5 sec Discharge Thermistor
sec. 2 times Error
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0.1 0.5 sec Outdoor Heat Exchanger
sec. 3 times Thermistor Error
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0.1 0.5 sec Outdoor Temperature
sec. 4 times Thermistor Error
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0.1 0.5 sec Forced Auto Switch
sec. 2 times Error
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The room temperature thermistor detected a abnormal temperature when the power was turned on.
> Remote control does not operate.
[Diagnosis Point]
- Check Thermistor resistance value (Refer to "Thermistor characteristics table").
- Controller PCB defective.
The detection value of the indoor heat exchanger thermistor is either open or shorted when the power is ON.
> Remote control does not operate.
[Diagnosis Point]
- Check Thermistor resistance value (Refer to "Thermistor characteristics table").
- Controller PCB defective.
The detection value of the discharge thermistor is either open or shorted
> Compressor, Outdoor Fan : OFF (It automatically releases when the normal value is detected.)
[Diagnosis Point]
- Check Thermistor resistance value (Refer to "Thermistor characteristics table").
- Controller PCB defective.
The detection value of the outdoor heat exchanger thermistor is open.
> Compressor, Outdoor Fan : OFF (It automatically releases when the normal value is detected.)
[Diagnosis Point]
- Check Thermistor resistance value (Refer to "Thermistor characteristics table").
- Controller PCB defective
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.)
[Diagnosis Point]
- Check Thermistor resistance value (Refer to "Thermistor characteristics table").
- Controller PCB defective.
Forced Auto Switch becomes ON for 10 consecutive seconds.
> It indicates the error but the operation continues.
[Diagnosis Point]
- Check if Forced Auto Switch is kept pressed.
- Forced Auto Switch defective.
- Controller PCB defective.