Min - Max Low

Alpha Min - Max Fault Code

Also written as MINMAX — same fault.

The Alpha Min - Max fault code means: your boiler is currently in a manual setup mode for output adjustments rather than reporting a functional breakdown.. It appears on 4 Alpha models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Adjustable operating curves (Blue LED)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

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Alpha models that show the Min - Max fault code

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

Source

Alpha Min - Max 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