Service manual

Error Codes: Indoor Units ESIE03–01

3–34 Part 3 – Troubleshooting

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:

P Thermistor input > 4.96 V, or

P Thermistor output < 0.04 V.

Causes The possible causes are:

P Malfunctioning connector connection

P Malfunctioning thermistor

P Malfunctioning PCB

P Broken or disconnected wire.

Checking

thermistors

See page 3–78.

Error Description

Malfunctioning heat exchanger thermistor system.

Malfunctioning suction air thermistor system.

Operation HAP (green) HBP (green)

Normal

Malfunctioning