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Troubleshooting
Service manual
31
RXQ25+3 3 3
35AMV1B
Split Sensira R32 BBOP
ESIE21-16 – 2022.02
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check that all stop valves of the refrigerant circuit are open. See
Possible cause:
Closed stop valve in the refrigerant circuit.
2
Check if the refrigerant circuit is clogged. See
Possible cause:
Clogged refrigerant circuit.
3
Check if the refrigerant circuit is correctly charged. See
Possible cause:
Refrigerant overcharge or shortage.
4
Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
120].
Possible cause:
Non‑condensables and/or humidity in the refrigerant circuit.
5
Perform a check of the main PCB. See
81].
Possible cause:
Faulty main PCB.
6
Perform a check of the compressor. See
50].
Possible cause:
Faulty compressor or miswiring of the compressor power
supply cable.
7
Check if the power supply is compliant with the regulations. See
Possible cause:
▪
Faulty or disturbance of the power supply (power supply MUST be within
range of nominal operating voltage ±4%),
▪
Power drop,
▪
Short circuit.
Prerequisite:
Stop the unit operation via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
8
Wait until the rectifier voltage is below 10 V DC.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
9
Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause:
Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.