BoilerFaultCodesAlpha 72 Fault Code
The Alpha 72 fault code means: your boiler's computer system has detected that some of its internal settings have drifted or been changed, and it needs a professional to recalibrate it to run correctly.. It appears on 6 Alpha models in our database.
Technical description: Fast calibration required - The PCB detects that some parameters have been altered
DIY fix possible
Locate the selector switch on the front of the boilerTurn the switch to the 'Reset' position for a few secondsReturn the switch to the 'On' position and wait for the boiler to complete its automatic calibration cycle
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Alpha models that show the 72 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 72 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