Glow Worm fault diagnostics

Real-world checklists generated by BoilerTag's AI from submissions by UK gas engineers. Search by make, model, or fault code, or browse a manufacturer below.

15 fault checklists · 6 boiler makes · 9 fault codes

Showing 2 of 2 diagnostics

Glow Worm Energy 25c — F.32
The Glow Worm Energy 25c displaying fault code F.32, with the fan cycling erratically and making a struggling humming noise, indicates an 'air pressure issue' or 'fan speed outside the tolerance values'. This is often caused by a fan malfunction, blocked air intake/flue, or a faulty Hall sensor. The intermittent nature becoming constant suggests a component is failing completely.
Published 12th May 2026
Glow Worm Energy 25c — F.28
The Glow Worm Energy 25c displaying an F.28 fault code indicates an ignition failure. This means the boiler is attempting to ignite but is unable to establish a flame. The clicking noise you hear is likely the boiler trying to spark. Common causes range from simple gas supply issues to more complex component failures within the ignition system. The pressure gauge reading of 1 bar is within the normal cold operating range, so low pressure is unlikely to be the primary cause of this specific fault.
Published 24th April 2026

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