Daikin Sky Air R-407C - Thermistor Abnormality (C4 or C9)

Error Codes: Indoor Units ESIE02–01
3–30 Part 3 – Troubleshooting
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2.7 Thermistor Abnormality (C4 or C9)
Error code The table below describes the two thermistor abnormalities.
LED indications The table below shows the LED indications.
Error generation The error is generated when during compressor operation:
■ Thermistor input > 4.96 V, or
■ Thermistor output < 0.04 V.
Causes The possible causes are:
■ Malfunctioning connector connection
■ Malfunctioning thermistor
■ Malfunctioning PCB
■ Broken or disconnected wire.
Checking
thermistors
See page 3–72.
Error Description
C4
Malfunctioning heat exchanger thermistor system.
C9
Malfunctioning suction air thermistor system.
Operation HAP (green) HBP (green)
Normal 66
Malfunctioning 66