Low
Neon B Flashing very slowly on Alpha CB 240 / 280

Your boiler is currently in standby mode and is working exactly as it should be.

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.

Technical description

Electricity supply to the boiler is on.

DIY fix possible

Check your thermostat or programmer settingsEnsure the heating or hot water demand is turned up sufficiently to wake the unit

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

New boiler cost 2026

Realistic UK prices for a swap.

Read →