Daikin B-Series Service Manual page 147

Troubleshooting
Troubleshooting
Check No.06
Refer to P.144
Check No.07
Refer to P.145
Check No.09
Refer to P.146
Note1: Refer to "1.3 Application of Silicon grease to a power transistor and a diode bridge" on P198.
136
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
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
Si04-306E
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.
(R7339)
Service Diagnosis