28 High

Alpha 28 Fault Code

The Alpha 28 fault code means: your boiler is struggling because the internal fan that clears out exhaust gases isn't spinning or reporting its speed correctly, so it has safely shut down to prevent unsafe operation.. It appears on 3 Alpha models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Fan fault (no Hall signal)
Typical repair cost £180-350 (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 28 fault code

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

Source

Alpha 28 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