BoilerFaultCodesGlow-worm Orange Light Fault Code
Also written as ORANGELIGHT — same fault.
The Glow-worm Orange Light fault code means: your boiler is receiving electrical power and is currently switched on or ready to operate.. It appears on 1 Glow-worm model in our database.
Technical description: MAINS
What causes the Glow-worm Orange Light fault?
The orange light indicates that the boiler is receiving a live electrical supply and the main switch is set to the 'on' position. This is a normal operational status and does not represent a physical failure or a broken part. If your boiler is not providing heating despite this light being on, it usually means the system is simply waiting for a command from your thermostat or timer.
DIY fix possible
Check that the power switch on the wall or fused spur is turned onEnsure your room thermostat is turned up high enough to call for heatCheck if any timers or programmers are set to an 'ON' period
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Gas Safe Register →Glow-worm models that show the Orange Light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm Orange Light 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