How much does it cost to fix Baxi error code Neon 9?

Typical repair cost for the Baxi Neon 9 fault is £180-350 including labour.

Neon 9 High

Baxi Neon 9 Fault Code

Q: What does the Baxi Neon 9 fault code mean?

Your boiler has detected that the water pressure is too low or the pump isn't circulating water correctly, causing the system to shut down for safety.

Also written as NEON9 — same fault.

The Baxi Neon 9 fault code means: your boiler has detected that the water pressure is too low or the pump isn't circulating water correctly, causing the system to shut down for safety.. It appears on 2 Baxi models in our database.

Technical description: Fault on Pump or Low System Pressure

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 low, use the filling loop underneath the boiler to top it up until the needle reaches 1.2 bar.Restart the boiler to see if the fault light clears.

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Baxi models that show the Neon 9 fault code

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

Source

Baxi Neon 9 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