What does the Glow-worm Reset LED is lit fault code mean?

Your boiler has sensed it is getting too hot and has shut itself down as a safety precaution.

How much does it cost to fix Glow-worm error code Reset LED is lit?

Typical repair cost for the Glow-worm Reset LED is lit fault is £100-280 including labour.

Can I fix Glow-worm fault code Reset LED is lit myself?

Check that all radiator valves are open and not turned to zero.

Glow-worm Reset LED is lit Fault Code: What It Means & How to Fix It

Technical description

Check water system for overheating. Reset by turning temperature control knob off and on.

What causes this fault?

This fault occurs when the water inside the heat exchanger reaches a dangerously high temperature, triggering a safety sensor to cut the power. The most common reasons are a failed pump that isn't moving the water away fast enough, or a blockage such as air or sludge trapped within the pipework.

This issue often appears when the heating is first turned on after summer, as pump components can seize up during long periods of inactivity.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register →

Your boiler has sensed it is getting too hot and has shut itself down as a safety precaution.

Technical description

What causes this fault?

Engineer required

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