BoilerFaultCodesHeatline 10 Fault Code
The Heatline 10 fault code means: your boiler is struggling to clear exhaust gases safely because it cannot confirm that the internal fan is moving air properly, so it has shut down to prevent unsafe operation.. It appears on 3 Heatline models in our database.
Technical description: Air pressure switch failure
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Heatline models that show the 10 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline 10 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026