Low
00 on Ideal Logic Code Combi ESP1

Your boiler is perfectly healthy and is simply resting because it is not currently being asked to provide heating or hot water.

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

Standby, no demand for heat present.

From this model's manual
Verified against the Ideal Logic Max Combi installation & service manual, page 36.
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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