SiBE18-821_C
Troubleshooting for Outdoor Unit
Troubleshooting
411
7.25 Power Supply Insufficient or Instantaneous Failure
Remote
Controller
Display
U2
Method of
Malfunction
Detection
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
Decision
Conditions
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power
supply voltage are detected
Supposed
Causes
Power supply insufficient
Instantaneous power failure
Defective outdoor fan motor
Defective main PCB (A1P)
Troubleshooting
Check No.03
Refer to P.425
Is the power
supply voltage
200~240V ±10%?
Is the P-N
resistance not less
than several hundred
of ohms?
Check No.03
Is the resistance above
standard value?
Is the
measured voltage 220 -
240 VDC or
more?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Correct power supply
Field factors
Replace the main PCB
(A1P).
(R13044)
YES
YES
YES
NO
NO
Replace the fan motor.
NO
Monitor the voltage
(Instantaneous voltage
drop)
YES
NO
When the compressor is
running, measure the voltage
b and - of
electrolytic capacitor (C+, C-).
