GAS TAP STIFF Emergency

Chaffoteaux GAS TAP STIFF Fault Code

Also written as GASTAPSTIFF — same fault.

The Chaffoteaux GAS TAP STIFF fault code means: the control knob for your gas supply has become stuck or seized, making it difficult or impossible to safely turn the boiler on or off.. It appears on 1 Chaffoteaux 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: i) Grease dried ii) Operating mechanism replaced incorrect
Typical repair cost £120-220 (including labour)

Engineer required

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

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Chaffoteaux models that show the GAS TAP STIFF fault code

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

Source

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

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