Boiler displays A17, heating stops, pump may continue to run for a while.

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 return NTC sensor, Loose connector on return sensor, PCB analogue input failure

Safety: Turn off power before removing covers.

Technician – locate return NTC: Find the return temperature sensor on the Beretta return pipe. Check for secure fit and corrosion.
Measure resistance: Compare NTC resistance to temperature charts. Replace if out of specification.
Check wiring: Ensure the harness is intact and firmly connected to the PCB.
PCB diagnosis: If all else is correct, replace the main PCB.

Medium 3/5

Return NTC Sensor

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