Outdoor Unit: Cool/Heat Switchover Problem - Daikin FTXP20-71L Service Manual

2.5.12 EA-00 – Outdoor unit: Cool/heat switchover problem
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
3 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
4 Check if the power supply is compliant with the regulations. See
4
circuit" [ 142].
Possible cause:
▪ Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪ Power drop,
▪ Short circuit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Room thermistor is NOT
functioning within
operation range.
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
Possible cause: Faulty 4‑way valve.
2 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
3 Perform a check of the indoor unit air (room) thermistor. See
"3.13 Thermistors" [
Possible cause: Faulty indoor unit air (room) thermistor.
4 Perform a check of the indoor unit main PCB. See
4
PCB" [ 78].
Possible cause: Faulty indoor unit main PCB.
5 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
6 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
"3.7 Main
Effect
Unit will NOT stop
operating.
If the error occurs too
soon: unit will stop
operating.
"3.1 4-way
"3.7 Main
4
129].
4
144].
2 Troubleshooting
|
4
PCB" [ 84].
"4.1 Electrical
Reset
Automatic reset after a
continuous operation for
some time.
Manual reset via user
interface.
4
valve" [ 46].
4
PCB" [ 84].
"3.6 Indoor unit main
"4.2 Refrigerant circuit" [
Service manual
4
144].
23