BoilerFaultCodesGlow-worm Burner indicator Flashing Fault Code
Also written as BURNERINDICATORFLASHING — same fault.
The Glow-worm Burner indicator Flashing fault code means: your boiler has detected a simple operating error that usually means a control knob is in the wrong position or the system needs a basic restart.. It appears on 2 Glow-worm models in our database.
Technical description: Error. Check the Hot Water knob for correct position and reset the boiler by turning the left knob on (reset) position for a few seconds.
What causes the Glow-worm Burner indicator Flashing fault?
This fault usually occurs because one of the control knobs has been left in a 'transition' or 'off' position, preventing the software from starting the ignition sequence. It can also be triggered by a minor communication glitch between the user interface and the main circuit board. In most cases, the boiler is simply waiting for a clear signal from the dials to confirm which mode it should be operating in.
DIY fix possible
Check that the Hot Water control knob is set to a normal temperature positionTurn the left-hand control knob to the 'Reset' positionHold it for a few seconds, then turn it back to your desired setting
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Gas Safe Register →Glow-worm models that show the Burner indicator Flashing fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Burner indicator Flashing 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