Troubleshooting for Outdoor Unit SiUS12-928_B
187 Service Diagnosis
Troubleshooting 18 class
Check No.01
Refer to P.191
Check No.17
Refer to P.198
Check No.19
Refer to P.199
Note: Refer to “Application of silicon grease to a power transistor and a diode bridge” on page 267 for
detail.
Make sure the power has been off for at least 30 seconds.
(R17368)
Caution
NO
Slightly dirty
NG
Too dirty
OK
NO
YES
NO
YES
∗ Fin thermistor
(Precaution before turning on the power again)
Turn off the power and turn it on
again to start the system.
Check the radiation fin
temperature.
Check No. 17
Check the installation condition.
NO
YES
YES
Above A ?
Radiation fin dirty?
As
described in the
thermistor characteristic
chart?
Check No. 01
Check the thermistor resistance
value.
Check No. 19
Check the outdoor fan or
related.
Error displayed again?
Has PCB been replaced?
Replace the fin thermistor.
Check if the silicon grease
(
∗
) is applied properly on
the radiation fin. If not,
apply it.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Replace the outdoor fan
motor.
Correct the connectors and
fan motor leads.
Clean up the radiation fin.
∗
Silicon grease
Part No.: 1
172698
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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