Power Supply Insufficient Or Instantaneous Failure - Daikin LRYEQ16AY1 Service Manual

Troubleshooting

8.4.50 Power Supply Insufficient or Instantaneous Failure

U2
Error Code
Applicable LRYEQ16AY1
Models
Method of Error Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Detection
Error Decision When the voltage aforementioned is less than 190V
Conditions
Supposed
Causes
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the condition of the power
supply.
Check if power supply voltage is
200V ± 10%.
Check if there is open phase or
defective wiring.
Check if power supply voltage side
unbalance is within 6V.
There are problems
on the condition of
described above.
The insulation resistance
of compressor is not more
resistance of fan motor
is not more 1MΩ.
237
Power supply insufficient
Instantaneous power failure
Open phase
Defective inverter PCB
Defective outdoor control PCB
Defective compressor
Defective main circuit wiring
Defective fan motor
Defective connection of signal cable
YES
power supply
NO
YES
100kΩ.
NO
The insulation
YES
NO
A
SiBE811001EB
Correct the fault.
Replace the compressor.
Replace the fan motor.
∗ If the fan motor is badly
damaged, replace the
fan PCB (A5P or A9P).
CONVENI-PACK