6 Emergency

Halstead 6 Fault Code

The Halstead 6 fault code means: your boiler is still detecting a flame even after it should have turned off, which is a safety conflict that requires a professional inspection.. It appears on 1 Halstead model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Flame continues after demand ends - 5 sec flame signal after burner is switched off
Typical repair cost £120-350 (including labour)

Engineer required

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

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Halstead models that show the 6 fault code

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

Source

Halstead 6 fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.

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