Low
S.06 on Glow-worm MicraCom

Your boiler is simply finishing a cooling cycle after the heating has switched off, which is a normal part of its operation.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

The fan overrun for heating mode is activated.

From this model's manual
Verified against the Glow Worm Micracom installation & service manual, page 43.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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