BoilerFaultCodesGlow-worm S.14 Fault Code
Also written as S14 — same fault.
The Glow-worm S.14 fault code means: your boiler is not showing an error; it is simply displaying a status message to let you know that the burner is currently active and heating your water.. It appears on 9 Glow-worm models in our database.
Technical description: burner on
What causes the Glow-worm S.14 fault?
This code appears when the boiler is functioning correctly and the internal burner has successfully lit to heat your home or hot water. It is triggered by a demand from your thermostat or a hot tap, signaling that the gas valve has opened and the ignition process is complete. There is no fault to fix as this is simply the boiler confirming it is currently burning fuel to provide heat.
DIY fix possible
No action is required as this is a normal operating status.Ensure your thermostat or hot water tap is calling for heat.Monitor the display to see if it changes to other normal status codes like S.04 or S.00.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Glow-worm models that show the S.14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm S.14 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