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
voltage are detected
Conditions
Supposed
Causes
Troubleshooting
Check No.32
Refer to P.265
When the compressor is
running, measure the voltage
between + and – of
electrolytic capacitor (C+, C–).
254
Power supply insufficient
Instantaneous power failure
Defective outdoor fan motor
Defective main PCB (A1P)
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
between each pin of the fan
motor above
standard
value?
YES
Is the
NO
measured voltage 220 -
240 VDC or
more?
YES
SiUS181631EA
Correct the power supply.
Field factors
Replace the fan motor.
Replace the main PCB
(A1P).
Monitor the voltage
(Instantaneous voltage
drop)
(R22105)
Troubleshooting