Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 132
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Correct power supply.
Is the
power supply voltage
208~230V ±10%?
Has the power transistor
malfunctioned?
YES
NO
YES
NO
YES
Replace the inverter P.C.B.
(A1P).
Monitor the voltage.
(Instantaneous voltage drop)
YES
NO
When the compressor is running,
measure the voltage between
+ and - of electrolytic capacitor
(C+, C-).
CHECK 3
Is the resistance
above standard
value?
Is the measured voltage
220 VDC or more?
Replace the fan motor.
NO
(P.158)
Check the inverter power transistor.
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.
CHECK 4
(P.158)