Daikin Aurora Series, Service Manual

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SiUS341802E Troubleshooting by Error Code
Service Diagnosis 238
2.47.3 Inverter Radiation Fin Temperature Rise Abnormality (Diode Bridge)
Error Code
L4
Sub code: 12-14
Applicable
Models RXLQ96/120TATJU, RXLQ96/120TAYDU
Method of Error
Detection
Diode bridge radiation fin temperature is detected by the thermistor.
Error Decision
Conditions
Detected temperature exceeds a certain level.
Supposed
Causes
„
Insulation sheet (blue) improperly fixed on the heat sink
„
Radiation fin plate not fixed with screws
„
U0 error
„
Defective diode bridge
„
High outdoor air temperature
Troubleshooting
Turn ON the
power supply, and
check if the error recurs
when operation
starts.
Turn ON the
power supply, and
check if the error recurs
when operation
starts.
Troubleshooting is finished.
Replace the diode bridge (V1R).
If the problem recurs, replace the
inverter PCB (A3P).
YES
Continue operation.
Field factor. Radiation fin temperature
may have risen due to high outdoor
temperature.
NO
Rectify troubles.
NO
Disconnect, and then
reconnect the connector
(X8A) for the fin thermistor on
the inverter PCB (A3P).
Normal?
YES
Replace the thermistor (R72T).
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.