BoilerFaultCodesAlpha 0A8 Fault Code
The Alpha 0A8 fault code means: your boiler is having trouble detecting the flame needed to heat your water, causing the system to shut down for safety.. It appears on 2 Alpha models in our database.
Technical description: Flame circuit fault
What causes the Alpha 0A8 fault?
This fault happens when the boiler's internal computer is unable to confirm that a flame has successfully lit inside the burner. The most common reasons are a worn-out sensor that can no longer 'see' the flame or a failure in the electrical circuit that sends this signal to the main control board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Alpha models that show the 0A8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 0A8 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