U2 Power Supply Voltage Abnormality - Daikin R71FUV1 Service Manual

Troubleshooting by Remote Controller
U2
3.88
Abnormality
Remote Controller Display
U2
Applicable Models
RZQ-K/H, RZQ(S)-B/C, RZR-KU/HU
Method of Error Detection
The error is detected according to the voltage of main
circuit capacitor built in the inverter and power supply
voltage.
Error Decision Conditions
When the voltage of main circuit capacitor built in the
inverter and power supply voltage drop (150-170 VAC) or
when the power failure of several tens of ms or more is
generated.
∗ Remote controller does not decide the abnormality.
Supposed Causes
Drop in power supply voltage (180 V or less)
Instantaneous power failure
Inverter open phase (Phase T)
Defective main circuit wiring
Defective outdoor unit inverter PCB
Main circuit parts damaged
Power Supply Voltage
Si20-701_B
363