SiUS28-902_B
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
137
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
the connector or parts may be damaged.
Caution
Is the power
transistor defective?
Is the power
supply voltage 208~230V
±10%?
When the compressor is running,
measure the voltage between
+ and - of electrolytic capacitor
(C+, C–).
Check the inverter power transistor.
Replace the inverter PCB.
Observe the conditions of the
PCB.
In the case of a serious failure,
a compressor failure may
cause the failure of the PCB.
Even if the PCB 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 PCB
replacement, check the
compressor.
NO
YES
CHECK 4
YES
NO
CHECK 3
NO
YES
YES
NO
Replace the inverter PCB
(A1P).
Monitor the voltage.
(Instantaneous voltage drop)
Replace the fan motor.
Correct power supply.
Is the resistance above
standard value?
Is the
measured voltage 220
VDC or more?
CHECK 3
CHECK 4
