Daikin 4MXS-R Series, Руководство по обслуживанию

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Troubleshooting for Outdoor Unit SiUS121736EA
203 Service Diagnosis
7.17 Thermistor or Related Abnormality (Outdoor Unit)
Error Code
H9, J3, J6, J8, J9, P4
Outdoor Unit LED
Display A
j
1
i
2
i
3
h
4
h
5
h
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 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 J8 error.
Supposed
Causes
„
Disconnection of the connector for the thermistor
„
Defective thermistor(s)
„
Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor
in cooling operation, or indoor heat exchanger thermistor in heating operation)
„
Defective outdoor unit PCB
Troubleshooting In case of P4
Replace the outdoor unit PCB (main PCB).
P4 : Radiation fin thermistor
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.