Boiler shows A24, no operation, may follow other sensor-related errors.

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

Short circuit between sensor wires, Multiple NTC failures, PCB sensor supply fault

Safety: Isolate power before testing circuits.

Visual inspection: Look for damaged or melted sensor wiring inside the Beretta boiler.
Disconnect sensors: One by one, disconnect NTC sensors and check if the error code changes, helping to identify the faulty circuit.
Technician – continuity tests: Use a multimeter to check for shorts between sensor lines and earth.
PCB replacement: If wiring and sensors are intact, replace the main PCB.

Hard 4/5

Main Control PCB

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