Daikin CTXU25G2V1B Service Manual page 147

Troubleshooting
Troubleshooting
Check No.02
Refer to P.162
Check No.03
Refer to P.163
Check No.05
Refer to P.163
Note: Refer to "1.3 Application of Silicon grease to a power transistor and a diode bridge" on P. xxx.
144
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn off the power supply and
turn it on again to get the system
started.
Does the fault
appear again?
NO
Check No.05
Outdoor fan system
check
YES
Radiation fin dirty?
Slightly dirty
Check No.03
Installation condition check
WARNING
To cool down the electricals, the
outdoor unit fan gets started when
the radiation fin temperature rises
above 75˚C even when the air
conditioning is not operated and
stops itself when it drops below
70˚C.
YES
Has PCB been replaced?
NO
Check No.02
Thermistor resistance check
· Fin thermistor
Check the radiation fin
temperature
Does the thermistor
meet the specification
chart of thermistor?
YES
Does the temperature
exceed the temperature
to stop operation?
YES
NO
Too dirty
SiBE12-908
YES
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it.
∗ Silicon grease
Part No.: 1172698
NO
Replace the fin thermistor.
NO
Check the power transistor
and fin for looseness. If
they are found to be fit
tightly,replace the PCB or
the power transistor.
Replace the fan motor.
Rectify the connector and
the fan motor lead wire.
Replace the outdoor unit
PCB.
Clean up the radiation fin.
(R9448)
Service Diagnosis