High
01 on Glow-worm Ci Range

Your boiler has stopped working because it cannot light the gas flame or it can't detect that the flame is lit.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Ignition fault (lockout) caused by no gas, no detection

From this model's manual
Verified against the Glow Worm Ci Range installation & service manual, page 34.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

What causes this fault?

This fault occurs when the boiler attempts to start up but fails to establish a flame after several attempts. The most common reasons include a lack of gas reaching the unit, worn-out spark electrodes that can no longer ignite the fuel, or a faulty sensor that fails to tell the boiler the flame is safely lit.

This fault is more common during extreme cold snaps, as external gas meters or regulators can sometimes freeze, restricting the flow of gas to the property.

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.

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