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Troubleshooting
Service manual
32
RXQ25+3 3 3
35AMV1B
Split Sensira R32 BBOP
ESIE21-16 – 2022.02
2.5.24 P4-00 – Outdoor unit: Malfunction of radiating fin temperature sensor
Trigger
Effect
Reset
Radiating fin thermistor
input is out of range.
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 main PCB. See
Possible cause:
Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.5.25 U0-00 – Outdoor unit: Shortage of refrigerant
Trigger
Effect
Reset
Refrigerant shortage
detected.
Unit will stop operating.
Automatic reset.
Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform
a
check
of
all
refrigerant
side
thermistors.
See
Possible cause:
Faulty refrigerant side thermistor(s).
2
Check that all stop valves of the refrigerant circuit are open. See
120].
Possible cause:
Closed stop valve in the refrigerant circuit.
3
Check if the refrigerant circuit is clogged. See
120].
Possible cause:
Clogged refrigerant circuit.
4
Check if the refrigerant circuit is correctly charged. See
120].
Possible cause:
Refrigerant shortage.
5
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.
6
Perform a check of the compressor. See
Possible cause:
Faulty compressor or miswiring of the compressor power
supply cable.
7
Perform a check of the expansion valve. See
65].