Thermistor Abnormality - Daikin Sky Air R-407C Service Manual

Error Codes: Indoor Units
2.7 Thermistor Abnormality (C4 or C9)
1
Error code
LED indications
3 3
Error generation
4
Causes
5
Checking
thermistors
3–30
The table below describes the two thermistor abnormalities.
Error Description
Malfunctioning heat exchanger thermistor system.
C4
Malfunctioning suction air thermistor system.
C9
The table below shows the LED indications.
Operation
Normal
Malfunctioning
The error is generated when during compressor operation:
Thermistor input > 4.96 V, or
Thermistor output < 0.04 V.
The possible causes are:
Malfunctioning connector connection
Malfunctioning thermistor
Malfunctioning PCB
Broken or disconnected wire.
See page 3–72.
HAP (green)
6
6
ESIE02–01
HBP (green)
6
6
Part 3 – Troubleshooting