Alpha C27 Fault codes & diagnostics

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

Combi Natural Gas 27 kW Discontinued
GC Numbers 47-532-2247-532-23
Download the Alpha C27 manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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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A Illuminated continuously

Your boiler has attempted to start but is unable to ignite its internal flame, meaning your heating and hot water will not work.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for A Illuminated continuously
Status & diagnostic codes

1 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Neon B Flashing very slowly Status Your boiler is currently stuck in a standby or waiting mode because it is receiving power but has not been triggered to start heating.