BoilerFaultCodesAlpha 0A2 Fault Code
The Alpha 0A2 fault code means: your boiler is failing to detect a flame, so it has safely shut down to prevent the release of unburnt gas.. It appears on 3 Alpha models in our database.
Technical description: Flame detection fault. Check flame sensing electrode connections. Check for a short circuit to the electrode or wires.
What causes the Alpha 0A2 fault?
This fault occurs when the boiler's control system cannot confirm that a flame has successfully ignited inside the burner. The most common reasons include a worn-out sensor that monitors the fire, a blockage in the gas supply, or an electrical issue preventing the ignition spark from triggering.
This fault can occasionally appear during the first cold snap of autumn when a boiler has been inactive all summer and the gas components have become slightly stuck or dusty.
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 0A2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 0A2 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