Power Supply Insufficient Or Instantaneous Failure - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit

7.25 Power Supply Insufficient or Instantaneous Failure

U2
Error Code
Method of Error
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Detection
Error Decision
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power supply
Conditions voltage are detected
 Power supply insufficient
Supposed
 Instantaneous power failure
Causes
 Defective outdoor fan motor
 Defective main PCB (A1P)
Troubleshooting
Check No.32
Refer to P.222
between each pin of the fan
When the compressor is
running, measure the voltage
between + and - of
electrolytic capacitor (C+, C-).
211
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the power
NO
supply voltage
200~240V ±10%?
YES
Is the P-N
NO
resistance not less
than several hundred
of ohms?
YES
Check
No.32
Is the resistance
NO
motor above
standard
value?
YES
Is the
YES
measured voltage 220 -
240 VDC or
more?
NO
SiUS181305E
Correct the power supply.
Field factors
Replace the fan motor.
Monitor the voltage
(Instantaneous voltage
drop)
Replace the main PCB
(A1P).
(R19139)
Troubleshooting