B neon flashing High

Baxi B neon flashing Fault Code

Also written as BNEONFLASHING — same fault.

The Baxi B neon flashing fault code means: your boiler has stopped working because water is not moving through the system properly or there is not enough water inside it.. It appears on 1 Baxi model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Pump failure or lack of primary water flow; go to section B
Typical repair cost £180-350 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop to top it up.Ensure all radiator valves and isolation valves are fully open.

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Baxi models that show the B neon flashing fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi B neon flashing fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026