F0 High

Alpha F0 Fault Code

The Alpha F0 fault code means: your boiler's electronic settings do not match the physical flue pipe installed, needing a quick adjustment to confirm the pipe length is set correctly for your home.. It appears on 5 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: Flue length parameter - should be changed for flue lengths over 4.5 m
Typical repair cost £90-150 (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 F0 fault code

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

Source

Alpha F0 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