S.06 Medium

Glow-worm S.06 Fault Code

Also written as S06 — same fault.

The Glow-worm S.06 fault code means: your boiler's fan is continuing to run after it should have stopped, causing the system to pause for safety reasons.. It appears on 12 Glow-worm models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: fan overrun

What causes the Glow-worm S.06 fault?

This fault occurs when the boiler's control system detects that the fan is still spinning even though the heating or hot water demand has finished. The most common reason is a communication error between the fan and the main circuit board, or a sticking internal component that fails to cut power to the fan motor. For safety, the boiler will pause operation until it detects the fan has correctly stopped.

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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Glow-worm models that show the S.06 fault code

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

Source

Glow-worm S.06 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026