BoilerFaultCodesGlow-worm LED 1 (RESET) Constant Light Fault Code
Also written as LED1RESETCONSTANTLIGHT — same fault.
The Glow-worm LED 1 (RESET) Constant Light fault code means: your boiler has failed to light after several attempts and has locked itself out for safety.. It appears on 4 Glow-worm models in our database.
Technical description: Ignition Lockout
What causes the Glow-worm LED 1 (RESET) Constant Light fault?
This fault occurs when the boiler fails to detect a flame after several ignition attempts, causing it to shut down as a safety precaution. The most common reasons include a worn-out spark electrode that can no longer light the gas, or a faulty gas valve that isn't letting fuel into the burner. In some cases, the internal control board may be failing to send the correct signals to start the ignition process.
DIY fix possible
Check that your gas pre-pay meter has credit (if applicable)Verify that other gas appliances in your home are workingPress and release the reset button once to restart the ignition sequence
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Gas Safe Register →Glow-worm models that show the LED 1 (RESET) Constant Light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm LED 1 (RESET) Constant 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