BoilerFaultCodesAlpha 30 Fault Code
The Alpha 30 fault code means: your boiler has detected that your heating pipes are not transferring heat effectively, usually caused by a blockage in the system or the pump struggling to move water around.. It appears on 3 Alpha models in our database.
Technical description: Temperature difference between system flow and return too high
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 30 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 30 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