U4-00 - Indoor/Outdoor Unit Communication Problem - Daikin Stylish Series Service Manual

1 | Troubleshooting
1.5.32 U4-00 – Indoor/outdoor unit communication problem
Service manual
28
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" [ 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" [
Possible cause: Faulty compressor.
3 Perform a check of the outdoor unit fan motor. See
4
motor" [ 89].
Possible cause: Faulty outdoor unit fan motor.
4 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
5 Perform a check of the inverter PCB. See
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.
Trigger
Communication failure
between outdoor and
indoor 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
4
circuit" [ 131].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.
"2.11 Main
"2.10 Inverter
Effect
Unit will stop operating.
(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +
"3.1 Electrical
4
45].
"2.12 Outdoor unit fan
4
PCB" [ 81].
4
PCB" [ 79].
Reset
Power reset via outdoor
unit.
"3.1 Electrical
RXA20~35A + RXA42+50B
Split Stylish R32
ESIE18-03C – 2020.02