Ferroli · Bluehelix Tech RRT

F10 / A10Flow sensor fault

This code applies to Bluehelix Tech RRT 24C, Bluehelix Tech RRT 28C, Bluehelix Tech RRT 34C, Bluehelix Tech RRT 18S, Bluehelix Tech RRT 24S, Bluehelix Tech RRT 30S. Fault codes narrow down the likely problem, but they do not replace a model-specific diagnosis.

What you can safely check

No internal homeowner repair is safe for this fault.
A single reset may be tried only where the model's user manual allows it.
Arrange an engineer if the code remains or returns.

How an engineer may fix it

Test the relevant sensor or thermistor, its position, resistance, plug and wiring; repair the connection or replace the failed sensor and verify operation.

Code availability varies slightly between combi and system outputs; confirm the exact model manual.

Manufacturer source: Ferroli — Bluehelix Tech RRT 24C Instructions for Use, Installation and Maintenance. Checked 15 August 2026. The appliance manual and an engineer’s on-site diagnosis take precedence. Never remove the boiler case yourself.