19 Emergency

Heatline 19 Fault Code

The Heatline 19 fault code means: your boiler is struggling to clear exhaust gases safely, so it has turned itself off to prevent any risk of fumes entering your home.. It appears on 3 Heatline models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Air pressure switch failure
Typical repair cost £150-300 (including labour)

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 19 fault code

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

Source

Heatline 19 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