Boiler shows A16, no heating, hot water may still function depending on model.

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

Faulty heating flow NTC sensor, Broken wiring to flow sensor, PCB input fault for CH circuit

Safety: Isolate power before working inside the boiler.

Check mode: Test both heating and hot water. Note if A16 appears only on heating demand.
Technician – inspect flow NTC: Locate the CH flow NTC on the Beretta boiler flow pipe. Check connection and measure resistance.
Check harness: Inspect the cable from the flow NTC to the PCB for damage or loose connectors.
PCB check: If sensor and wiring are sound, the main PCB may require replacement.

Medium 3/5

Flow NTC Sensor

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