Troubleshooting SiUS04-904
Service Diagnosis 133
Troubleshooting
Check No.06
Refer to P.146
Check No.07
Refer to P.147
Check No.09
Refer to P.148
Note1: Refer to “1.3 Application of Silicon grease to a power transistor and a diode bridge” on P256.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
(R10489)
Fin thermistor
NO
Slightly dirty
Malfunctioning
Too dirty
Functioning
NO
YES
NO
YES
Turn off the power and turn it on
again.
Check the radiation fin
temperature.
Check No. 07
Check the installation condition.
Radiation fin
dirty?
Above 194°F
(90°C)?
Thermistor as
specified in its characteristic
chart?
Check No. 06
Check the thermistor resistance
Check No. 09
Check the outdoor unit fan or
related.
Error again or
outdoor unit fan activated?
Replace the fin thermistor.
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 outdoor unit
PCB.
Replace the fan motor.
Correct the connectors and
fan motor leads.
Clean up the radiation fin.
NO
YES
Has PCB been
replaced?
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it
(
*
). (Note 1)
*
Silicon grease
Part No.: 1
172698
YES
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