Daikin Emura 3 Series Service Manual page 35

3.5.31 U2-00 – Outdoor unit: Defect of power supply voltage
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04 – 2022.04
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of all refrigerant side thermistors. See Thermistors.
Possible cause: Faulty refrigerant side thermistor(s).
2 Check that all stop valves of the refrigerant circuit are open. See
"5.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
3 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
4 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 62].
Possible cause: Refrigerant shortage.
5 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
6 Perform a check of the compressor. See Compressor.
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
7 Perform a check of the expansion valve. See Expansion valve.
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
"5.2 Refrigerant circuit" [
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.
Trigger
Power supply abnormality
or instant power failure is
detected.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check if the power supply is compliant with the regulations. See
4
circuit" [ 60].
4
62].
"5.2 Refrigerant
4
"5.2 Refrigerant circuit" [
4
62].
Effect
Unit will stop operating.
draft – 22/04/2022 08:50
3 | Troubleshooting
4
circuit" [ 62].
"5.2 Refrigerant
62].
Reset
Power reset via outdoor
unit.
"5.1 Electrical
Service manual
35