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

Typical repair cost for the Alpha Neon A flashing fault is £120-200 including labour.

Neon A flashing High

Alpha Neon A flashing Fault Code

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

Your boiler has lost the ability to accurately measure its own internal temperature, which causes it to shut down to prevent the system from getting too hot.

Also written as NEONAFLASHING — same fault.

The Alpha Neon A flashing fault code means: your boiler has lost the ability to accurately measure its own internal temperature, which causes it to shut down to prevent the system from getting too hot.. It appears on 7 Alpha models in our database.

Technical description: Temperature sensor fault

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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Alpha models that show the Neon A flashing fault code

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

Source

Alpha Neon A flashing 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 7 July 2026