Daikin FTXA20A - U2-00 - Outdoor Unit: Defect of Power Supply Voltage

1 | Troubleshooting
Service manual
28
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
2 Check that all stop valves of the refrigerant circuit are open. See
"3.2Refrigerant circuit"[4158].
Possible cause: Closed stop valve in the refrigerant circuit.
3 Check if the refrigerant circuit is clogged. See "3.2Refrigerant circuit"[4158].
Possible cause: Clogged refrigerant circuit.
4 Check if the refrigerant circuit is correctly charged. See "3.2 Refrigerant
circuit"[4158].
Possible cause: Refrigerant shortage.
5 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See "3.2Refrigerant circuit"[4158].
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
6 Perform a check of the compressor. See "2.2Compressor"[446].
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
7 Perform a check of the expansion valve. See "2.3Expansion valve"[457].
Possible cause: Faulty expansion valve.
8 Check for leaks in the refrigerant circuit. Look for oil traces on the unit(s).
Check the brazing points on the field piping. Perform a pressure test, see
"3.2Refrigerant circuit"[4158].
Possible cause: Leak in the refrigerant circuit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
1.5.31 U2-00 – Outdoor unit: Defect of power supply voltage
Trigger Effect Reset
Power supply abnormality
or instant power failure is
detected.
Unit will stop operating. Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check if the power supply is conform with the regulations. See "3.1Electrical
circuit"[4156].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >4%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the compressor. See "2.2Compressor"[446].
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.