U2 Insufficient Voltage - Daikin R71FUV1 Service Manual

Troubleshooting by Remote Controller
U2
3.87
Remote Controller Display
U2
Applicable Models
RZ(Y)
Method of Error Detection
Detection is based on the voltage in main circuit
capacitor for inverter and the supply voltage.
Error Decision Conditions
When the voltage in main circuit capacitor for inverter and
the supply voltage drop (171 - 190 VAC), or when power
outage of more than 20 or 30 ms occurs.
Supposed Causes
Supply voltage drop (lower than 198 V)
Momentary power failure
Open phase
Defective K1M
Defective contact or open circuit in X51A
Defective wiring in main circuit
Defective outdoor unit PCB
Damaged main circuit parts
Insufficient Voltage
Si20-701_B
361