U1-00 - Malfunction By Reverse Phase/Open Phase - Daikin EBLA04E V Series Service Manual

3.3.75 U1-00 – Malfunction by reverse phase/open phase
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
3 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.
4 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
5 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 256].
Possible cause: Refrigerant shortage.
6 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.
7 Perform a check of the compressor. See "4.7 Compressor" [
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
8 Perform a check of the expansion valve. See
Possible cause: Faulty expansion valve.
9 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
Outdoor unit main PCB
detects incorrect power
supply.
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" [ 254].
Possible cause:
▪ Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
4
256].
"5.2 Refrigerant
4
"5.2 Refrigerant circuit" [
"4.9 Expansion
4
256].
Effect
Unit will stop operating.
"4.14 Main
draft – 31/05/2022 15:53
3 | Troubleshooting
4
circuit" [ 256].
"5.2 Refrigerant
256].
4
148].
4
valve" [ 162].
Reset
Power reset via outdoor
unit.
"5.1 Electrical
4
PCB" [ 184].
Service manual
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