Ferroli · Bluehelix Tech RRT
A02Flame signal present while burner is off
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
- Do not keep resetting the boiler or open its case.
- Arrange a Gas Safe registered engineer.
- If you smell gas, leave the property and call the National Gas Emergency Service on 0800 111 999 from outside.
How an engineer may fix it
Isolate and test the gas valve circuit, valve tightness, ignition or flame-sensing system and control board; repair or replace components and complete required gas-safety checks.
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.