How much does it cost to fix Chaffoteaux error code 8.6?

Typical repair cost for the Chaffoteaux 8.6 fault is £90-180 including labour.

8.6 Medium

Chaffoteaux 8.6 Fault Code

Q: What does the Chaffoteaux 8.6 fault code mean?

The gas control dial or internal tap on your boiler has become difficult to turn or is physically stuck, preventing you from adjusting the gas flow.

Also written as 86 — same fault.

The Chaffoteaux 8.6 fault code means: the gas control dial or internal tap on your boiler has become difficult to turn or is physically stuck, preventing you from adjusting the gas flow.. It appears on 3 Chaffoteaux models in our database.

Technical description: Gas control tap stiff (User’s)

Typical repair cost £90-180 (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 8.6 fault code

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

Source

Chaffoteaux 8.6 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 27 April 2026