Outdoor Unit: Cool/Heat Switchover Problem - Daikin Emura RXJ20A5V1B Service Manual

3.5.15 EA-00 – Outdoor unit: Cool/heat switchover problem
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
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
"4.19 Thermistors" [
Possible cause: Faulty indoor unit air (room) thermistor.
4 Perform a check of the indoor unit main PCB. See
4
PCB" [ 103].
Possible cause: Faulty indoor unit main PCB.
5 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.
6 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
7 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 182].
Possible cause: Refrigerant overcharge or shortage.
8 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
Effect
Unit will NOT stop
operating.
If the error occurs too
soon: unit will stop
operating.
"4.1 4-way
"4.12 Main
4
169].
4
182].
"5.2 Refrigerant circuit" [
3 Troubleshooting
|
Reset
Automatic reset after a
continuous operation for
some time.
Manual reset via user
interface.
4
valve" [ 53].
4
PCB" [ 117].
"4.9 Indoor unit main
"5.2 Refrigerant circuit" [
"5.2 Refrigerant
4
182].
4
182].
Service manual
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