U2 Power Supply Insufficient Or Instantaneous Error - Daikin VRVII Manual

Troubleshooting by Indication on the Remote Controller
U2
3.60
or Instantaneous Error
Remote Controller Display
U2
Applicable Models
VRVIII Series
Method of Error Detection
Detection of voltage of main circuit capacitor built in the
inverter and power supply voltage.
Error Decision Conditions
When the voltage aforementioned is not less than 780V
or not more than 320V, or when the current-limiting
voltage does not reach 200V or more or exceeds 740V
For 230V units: When the voltage aforementioned is not
more than 190V
Supposed Causes
Power supply insufficient
Instantaneous power failure
Open phase
Defective inverter PCB
Defective control PCB
Defective main circuit wiring
Defective compressor
Defective fan motor
Defective connection of signal cable
Power Supply Insufficient
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