S.76 Medium

Glow-worm S.76 Fault Code

Also written as S76 — same fault.

The Glow-worm S.76 fault code means: your boiler has paused because it is waiting for a stable reading from the internal water pressure sensor.. It appears on 19 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: Waiting period – pressure sensor

What causes the Glow-worm S.76 fault?

This fault occurs when the boiler's control panel cannot get a consistent or reliable signal from the internal water pressure sensor. It usually happens because the sensor itself has developed an electrical fault or is being affected by debris and sludge within the heating system. In some cases, a loose or damaged wiring connection between the sensor and the main board is preventing the boiler from confirming there is enough water to operate safely.

Typical repair cost £120-200 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boilerIf the pressure is below 1.0 bar, use the filling loop to top it up to 1.5 barReset the boiler to see if the status code clears

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Glow-worm models that show the S.76 fault code

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

Source

Glow-worm S.76 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 31 August 2026