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

Typical repair cost for the Alpha Neon A flashing fault is £120-180 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's internal thermometer is providing confusing information, so it has turned itself off as a precaution to prevent overheating.

Also written as NEONAFLASHING — same fault.

The Alpha Neon A flashing fault code means: your boiler's internal thermometer is providing confusing information, so it has turned itself off as a precaution to prevent overheating.. It appears on 6 Alpha models in our database.

Technical description: Primary or DHW temperature sensor faulty

Typical repair cost £120-180 (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 27 April 2026