How much does it cost to fix Alpha error code Neon A?

Typical repair cost for the Alpha Neon A fault is £120-220 including labour.

Neon A High

Alpha Neon A Fault Code

Q: What does the Alpha Neon A fault code mean?

Your boiler has stopped working because it is unable to accurately measure the temperature of the water inside it.

Also written as NEONA — same fault.

The Alpha Neon A fault code means: your boiler has stopped working because it is unable to accurately measure the temperature of the water inside it.. It appears on 1 Alpha model in our database.

Technical description: Flashing on and off - Temperature sensor fault.

Typical repair cost £120-220 (including labour)

Engineer required

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

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Alpha models that show the Neon A fault code

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

Cd25 Repair: £120-220

Source

Alpha Neon A fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

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