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Troubleshooting for Outdoor Unit SiUS121632EA

184 Service Diagnosis

7.17 Thermistor or Related Abnormality (Outdoor Unit)

Error Code

Outdoor Unit LED

Display

Method of Error

Detection

This fault is identified based on the thermistor input voltage to the microcomputer.

A thermistor fault is identified based on the temperature sensed by each thermistor.

Error Decision

Conditions



The voltage between the both ends of the thermistor is above 4.96 V or below 0.04 V with the

power on.

 J3

error is judged if the discharge pipe temperature is lower than the heat exchanger

temperature.



The system is shut down if all the units are judged as the

error.

Supposed

Causes



Disconnection of the connector for the thermistor



Thermistor corresponding to the error code is defective.



Defective heat exchanger thermistor in the case of

error (outdoor heat exchanger thermistor

in cooling operation, or indoor heat exchanger thermistor in heating operation)



Defective outdoor unit PCB

Troubleshooting In case of

Replace the outdoor unit PCB (main PCB).

: Radiation fin thermistor

Caution

Be sure to turn off the power switch before connecting or disconnecting

connectors, or parts may be damaged.

Daikin 2MXL18QMVJU Service Manual

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