How much does it cost to fix Baxi error code Neon 8?

Typical repair cost for the Baxi Neon 8 fault is £120-200 including labour.

Neon 8 Medium

Baxi Neon 8 Fault Code

Q: What does the Baxi Neon 8 fault code mean?

Your boiler is struggling to accurately measure the temperature of the water being sent to your taps, which is preventing it from heating your water correctly.

Also written as NEON8 — same fault.

The Baxi Neon 8 fault code means: your boiler is struggling to accurately measure the temperature of the water being sent to your taps, which is preventing it from heating your water correctly.. It appears on 2 Baxi models in our database.

Technical description: Fault on Hot Water Sensor

Typical repair cost £120-200 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the Neon 8 fault code

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

Source

Baxi Neon 8 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