neon illuminated Medium

Baxi neon illuminated Fault Code

Also written as NEONILLUMINATED — same fault.

The Baxi neon illuminated fault code means: your boiler is receiving power and is ready for use, but if you have no heating or hot water, it indicates a fault that is not currently being signaled by a specific light.. It appears on 15 Baxi models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: The On/Off/Reset selector is in the 'on' position and power is available.
Typical repair cost £100-250 (including labour)

DIY fix possible

Check that your room thermostat is turned upEnsure your programmer or timer is set to 'On'Check that the boiler pressure is between 1 and 1.5 bar on the gauge

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Baxi models that show the neon illuminated fault code

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

Source

Baxi neon illuminated 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 7 July 2026