Daikin Stylish Series - U4-00 - Indoor;Outdoor Unit Communication Problem

1 | Troubleshooting
Service manual
28
(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +
RXA20~35A + RXA42+50B
Split Stylish R32
ESIE18-03C – 2020.02
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131].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the compressor. See "2.2Compressor"[445].
Possible cause: Faulty compressor.
3 Perform a check of the outdoor unit fan motor. See "2.12 Outdoor unit fan
motor"[489].
Possible cause: Faulty outdoor unit fan motor.
4 Perform a check of the main PCB. See "2.11Main PCB"[481].
Possible cause: Faulty main PCB.
5 Perform a check of the inverter PCB. See "2.10Inverter PCB"[479].
Possible cause: Faulty inverter PCB.
6 Wait until the compressor restarts.
Possible cause:
▪ Momentary drop of voltage,
▪ Momentary power failure.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
1.5.32 U4-00 – Indoor/outdoor unit communication problem
Trigger Effect Reset
Communication failure
between outdoor and
indoor unit.
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131].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.