Daikin F-Series Service Manual page 246

SiBE12-712C
Troubleshooting
Check No.06
Refer to P.248
Check No.07
Refer to P.249
Check No.09
Refer to P.250
Note: Refer to "1.3 Application of Silicon grease to a power transistor and a diode bridge" on P 283.
Service Diagnosis
Be sure to turn off power switch before
Caution
connect or disconnect connector, or
parts damage may be occurred.
(Precaution before turning on the power again)
Make sure the power has been off
for at least 30 seconds.
Turn off the power and turn it on
again to get the system started.
Error displayed again?
NO
Check No. 09
Check the outdoor unit fan
or related.
Functioning
Radiation fin dirty?
Slightly dirty
Check No. 07
Check the installation condition.
YES
Has PCB been replaced?
NO
Check No. 06
Check the thermistor resistance
value.
Fin thermistor
Check the radiation fin
temperature.
Thermistor as
specified in its characteristic
chart?
YES
Above 90˚C?
YES
Malfunctioning
Too dirty
Troubleshooting
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
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it
(∗). (Note 1)
∗
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.
Correct the connectors and
fan motor leads.
Replace the outdoor unit
PCB.
Clean up the radiation fin.
(R7147)
235