P08 Medium

Alpha P08 Fault Code

The Alpha P08 fault code means: your boiler has detected that it is running at its maximum heat capacity, which is likely due to an issue with the sensors or the internal control system.. It appears on 2 Alpha models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Max. heat power output
Typical repair cost £120-250 (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 P08 fault code

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

Source

Alpha P08 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