Boiler shows A22, display may indicate sensor discrepancy, heating performance poor.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

One of the NTC sensors (flow or return) faulty, Sensors swapped or incorrectly connected, PCB misreading sensor inputs

Safety: Isolate power before accessing sensors.

Technician – compare temperatures: With the boiler running, compare actual pipe temperatures with displayed values if available.
Check sensor connections: Ensure flow and return NTCs are connected to the correct terminals on the Beretta PCB.
Test sensors: Measure resistance of both NTCs at the same temperature; values should be similar. Replace any defective sensor.
PCB replacement: If sensors and wiring are correct, replace the main PCB.

Hard 4/5

Flow and Return NTC Sensors

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