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Troubleshooting
SiBE12-908
151
Service Diagnosis
Troubleshooting
Check No.02
Refer to P.169
Check No.03
Refer to P.170
Check No.05
Refer to P.170
Note:
Refer to “1.3 Application of silicon grease to a power transistor and a diode bridge” on P. 257.
(R9448)
Caution
Be sure to turn off power switch before connect or disconnect connector,
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?
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
NO
Check No.02
Thermistor resistance check
Outdoor fan system
check
Check No.05
Has PCB been replaced?
YES
NO
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it.
∗
Silicon grease
Part No.: 1172698
Fin thermistor
Check the radiation fin
temperature
Does the thermistor
meet the specification
chart of thermistor?
NO
Replace the fin thermistor.
YES
NO
YES
Does the temperature
exceed the temperature
to stop operation?
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.
NO
Too dirty
YES
Radiation fin dirty?
Slightly dirty
Check No.03
Installation condition check
Clean up the radiation fin.