Boiler shows A18, no hot water, heating may still operate normally.

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

Stuck or scaled DHW flow turbine, Blocked inlet filter on cold water, Faulty DHW flow sensor (Hall sensor), Wiring fault between sensor and PCB

Safety: Isolate power and close the cold water inlet before disassembling DHW components.

Check water supply: Ensure cold water supply to the boiler is on and that other taps in the property have good flow.
Clean inlet filter: Remove and clean the cold water inlet filter on the Beretta boiler if accessible.
Technician – inspect DHW flow turbine: Remove the flow sensor/turbine assembly, check for scale or debris, clean or replace as needed.
Check sensor wiring: Verify the Hall sensor connector is secure on the PCB.

Medium 3/5

DHW Flow Sensor / Turbine

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