Daikin FCQ18PVJU Service Manual page 139

SiUS28-902_a
Troubleshooting
Check the inverter power transistor.
When the compressor is running,
measure the voltage between
+ and - of electrolytic capacitor
(C+, C-).
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Is the
power supply voltage
208~230V ±10%?
YES
CHECK 4 ( P.158)
Has the power transistor
malfunctioned?
NO
CHECK 3 (P.158)
Is the resistance
above standard
value?
YES
YES
Is the measured voltage
220 VDC or more?
NO
Troubleshooting by Indication on the Remote Controller
NO
YES
NO
Correct power supply.
Replace the inverter P.C.B.
Observe the conditions of
the P.C.B.
In the case of a serious
failure, a compressor failure
may cause the failure of the
P.C.B. Even if the P.C.B. is
replaced, it may cause
failure again.
To avoid that, recheck the
compressor for ground and
for any broken wires.
Furthermore, even after the
completion of P.C.B.
replacement, check the
compressor.
Replace the fan motor.
Monitor the voltage.
(Instantaneous voltage drop)
Replace the inverter P.C.B.
(A1P).
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