BoilerFaultCodesPro AL10 Fault Code
The Pro AL10 fault code means: your boiler has stopped working because it cannot light the burner, likely due to a gas supply issue or a blockage in the drainage pipe.. It appears on 1 Pro model in our database.
Technical description: Ignition failure, flame not sensed, condense sensor activated
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hob.Inspect the white plastic pipe under the boiler for any blockages or freezing if the weather is cold.Press the Reset button once to see if the system restarts.
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Pro models that show the AL10 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Pro AL10 fault code information on this page is sourced and cross-checked against the official Pro service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026