U1-00 - Malfunction By Reverse Phase/Open Phase; U2-00 - Outdoor Unit: Defect Of Power Supply Voltage - Daikin altherma 3 M Service Manual

2 | Troubleshooting
2.3.69 U1-00 – Malfunction by reverse phase/open phase
2.3.70 U2-00 – Outdoor unit: Defect of power supply voltage
Service manual
58
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 conform with the regulations. See
4
circuit" [ 284].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >4%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the noise filter PCB. See
Possible cause: Faulty noise filter PCB.
3 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
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 conform with the regulations. See
4
circuit" [ 284].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >4%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the compressor. See "3.7 Compressor" [
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
3 Perform a check of the outdoor unit fan motor. See
4
motor" [ 217].
Effect
Unit will stop operating.
"3.15 Noise filter
"3.14 Main
Effect
Unit will stop operating.
Reset
Power reset via outdoor
unit.
"4.1 Electrical
4
PCB" [ 194].
4
PCB" [ 171].
Reset
Power reset via outdoor
unit.
"4.1 Electrical
4
134].
"3.16 Outdoor unit fan
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03