Low
13 on Ideal Classic NF

Your boiler is receiving power, but it is not currently detecting any demand for heating or hot water, meaning it is sitting in standby mode.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Mains electricity ON.

Shared across the Classic range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
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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All 8 fault codes on the Classic NF

Seeing a different code? Every code this model can display, in one place.

11122040fuse blownK1Neon SG1SG1

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