Flame Failure High

Main Flame Failure Fault Code

Also written as FLAMEFAILURE — same fault.

The Main Flame Failure fault code means: your boiler has stopped working because it failed to light or lost its flame during operation, so it has turned itself off for safety.. It appears on 2 Main models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Is the red “Flame Failure” reset button lit ? If so, press the Reset Button.
Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Main models that show the Flame Failure fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Main Flame Failure fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026