Daikin EHYHBH05AAV3, Service Manual

Page: 141 / 170

ESIE13-02A Error Codes: System Malfunctions
141 Part 4 – Troubleshooting
4
3
4
5
4
5.2
“U2”
Abnormal Power Supply Voltage
Remote controller
display
U2
Method of
malfunction
detection Malfunction is detected according to the voltage of main circuit capacitor built in the inverter and power
supply voltage.
Malfunction
decision conditions When the voltage of main circuit capacitor built in the inverter and power supply voltage drop:
for V3 only: 150-170 VAC or when the power failure of several tons of ms or longer is generated
or DC voltage is not in range of 305~380 VDC.
for W1 only: 300-320 VAC or when the power failure of several tons of ms or longer is generated
or DC voltage is not in scope of 508~620 VDC.
* 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)
Faulty main circuit wiring
Faulty outdoor inverter PC board
Main circuit parts damaged