Daikin FTXA25AW - Outdoor Unit: Cool;Heat Switchover Problem

1 | Troubleshooting
Service manual
17
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
3 Perform a check of the main PCB. See "2.12Main PCB"[491].
Possible cause: Faulty main PCB.
4 Check if the power supply is conform with the regulations. See "3.1Electrical
circuit"[4156].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >4%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
1.5.15 EA-00 – Outdoor unit: Cool/heat switchover problem
Trigger Effect Reset
Room thermistor is NOT
functioning within
operation range.
Unit will NOT stop
operating.
Automatic reset after a
continuous operation for
some time.
If the error occurs too
soon: unit will stop
operating.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the 4‑way valve. See "2.14-way valve"[440].
Possible cause: Faulty 4‑way valve.
2 Perform a check of the main PCB. See "2.12Main PCB"[491].
Possible cause: Faulty main PCB.
3 Perform a check of the indoor unit air (room) thermistor. See
"2.19Thermistors"[4144].
Possible cause: Faulty indoor unit air (room) thermistor.
4 Perform a check of the indoor unit main PCB. See "2.8 Indoor unit main
PCB"[475].
Possible cause: Faulty indoor unit main PCB.
5 Check that all stop valves of the refrigerant circuit are open. See
"3.2Refrigerant circuit"[4158].
Possible cause: Closed stop valve in the refrigerant circuit.
6 Check if the refrigerant circuit is clogged. See "3.2Refrigerant circuit"[4158].
Possible cause: Clogged refrigerant circuit.
7 Check if the refrigerant circuit is correctly charged. See "3.2 Refrigerant
circuit"[4158].