U1-00 - Malfunction By Reverse Phase/Open Phase; U2-00 - Outdoor Unit: Defect Of Power Supply Voltage - Daikin Sky Air FAA71BUV1B Service Manual

3.3.17 U1-00 – Malfunction by reverse phase/open phase
3.3.18 U2-00 – Outdoor unit: Defect of power supply voltage
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
5 Perform a check of the compressor. See outdoor unit service manual.
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
6 Perform a check of all expansion valve. See outdoor unit service manual.
Possible cause: Faulty expansion valve.
7 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 to the outdoor unit is compliant with the
regulations. See outdoor unit service manual.
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 A1P. See outdoor unit service manual.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
There is no zero‑cross
detected in approximately
10 seconds (indoor unit
PCB).
4
87].
Effect
Unit will stop operating.
Effect
Unit will stop operating.
3 Troubleshooting
|
Reset
Power reset via outdoor
unit.
Reset
Power reset.
Service manual
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