Outdoor Unit: Cool/Heat Switchover Problem - Daikin EBLA04E V Series Service Manual

3.3.43 EA-00 – Outdoor unit: Cool/heat switchover problem
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
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 room thermistor:
▪ Measure the room temperature and compare to the room temperature
shown on the user interface (remote controller).
▪ If temperature shown on the user interface differs from the measured
temperature, replace the user interface (remote controller). See
documentation of the user interface (remote controller) for more
information.
Possible cause: Faulty room thermistor.
4 Check the communication wiring between the remote controller and the unit.
See "4.20 User interface" [
Possible cause: Faulty wiring between the remote controller and the unit.
5 Perform a check of the hydro PCB. See
Possible cause: Faulty hydro PCB.
6 Check that all stop valves of the refrigerant circuit are open. See
"5.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
7 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
Effect
Unit will NOT stop
operating.
If the error occurs too
soon: unit will stop
operating.
"4.2 4-way
"4.14 Main
4
234].
"4.12 Hydro
4
256].
"5.2 Refrigerant
draft – 31/05/2022 15:53
3 | Troubleshooting
Reset
Automatic reset after a
continuous operation for
some time.
Manual reset via user
interface.
4
valve" [ 108].
4
PCB" [ 184].
4
PCB" [ 175].
4
circuit" [ 256].
Service manual
49