Daikin B-Series Service Manual page 220

Si12-714
Troubleshooting
Check No.06
Refer to P.219
Check No.07
Refer to P.220
Check No.09
Refer to P.221
Note1: Refer to "1.3 Application of Silicon grease to a power transistor and a diode bridge" on P315.
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector, Be sure to turn off power switch before connect or disconnect connector,
Caution Caution or parts damage may be occurred. or parts damage may be occurred.
Turn off the power and turn it on Turn off the power and turn it on
again to get the system started. again to get the system started.
Error displayed again? Error displayed again?
NO NO
Check No.09 Check No.09
Check the outdoor unit Check the outdoor unit
fan or related. fan or related.
Functioning Functioning
Radiation fin dirty? Radiation fin dirty?
Slightly dirty Slightly dirty
Check No. Check No. 07 07
Check the installation condition. Check the installation condition.
YES YES
Has PCB been
replaced?
NO
Check No. Check No. 06 06
Check the thermistor resistance Check the thermistor resistance
value. value.
Fin thermistor Fin thermistor
Check the radiation fin Check the radiation fin
temperature. temperature.
Thermistor as Thermistor as
specified in its characteristic specified in its characteristic
chart? chart?
YES YES
Above 90˚C? Above 90˚C?
YES YES
Malfunctioning Malfunctioning
Too dirty Too dirty
Troubleshooting
YES
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it
(∗). (Note 1)
∗Silicon grease
Part No.: 1172698
NO NO
Replace the fin thermistor.
Replace the fin thermistor.
NO NO
Check the power transistor
Check the power transistor
and fin for looseness. If and fin for looseness. If
they are found to be fit
they are found to be fit
tightly, replace the PCB or
tightly, replace the PCB or
the power transistor. the power transistor.
Replace the fan motor.
Replace the fan motor.
Correct the connectors and Correct the connectors and
fan motor leads.
fan motor leads.
Replace the outdoor unit Replace the outdoor unit
PCB.
PCB.
Clean up the radiation fin. Clean up the radiation fin.
(R7097) (R4713)
209