Ferroli · Bluehelix Tech RRT

A23 / A24 / A26 / F15 / F20 / F21 / F40 / F47 / F50 / F51 / F53PCB parameter configuration 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

Power-cycle or reset once only if the user manual specifically permits it.
If the message remains, arrange an engineer.

How an engineer may fix it

Check configuration, coding, communication buses, plugs, wiring, power supply and control boards; configure, repair or replace the failed control component.

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.