How much does it cost to fix Alpha error code Red neon (A) flashing?

Typical repair cost for the Alpha Red neon (A) flashing fault is £120-250 including labour.

Red neon (A) flashing High

Alpha Red neon (A) flashing Fault Code

Q: What does the Alpha Red neon (A) flashing fault code mean?

Your boiler has become too hot and has automatically turned itself off as a safety precaution to prevent damage.

Also written as REDNEONAFLASHING — same fault.

The Alpha Red neon (A) flashing fault code means: your boiler has become too hot and has automatically turned itself off as a safety precaution to prevent damage.. It appears on 1 Alpha model in our database.

Technical description: The boiler has overheated and the thermostat has automatically switched the boiler off.

Typical repair cost £120-250 (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 Red neon (A) flashing fault code

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

HETEC Repair: £120-250

Source

Alpha Red 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