Alpha HETEC Fault codes & diagnostics

1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 25 kW Discontinued

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Fault codes

All 1 documented codes

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Red neon (A) flashing

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

High Engineer only £120-250

Parts commonly replaced

  • Pump
  • Diverter valve
  • Heat exchanger
  • High limit thermostat
Full explanation for Red neon (A) flashing