19 High

Saunier Duval 19 Fault Code

The Saunier Duval 19 fault code means: your boiler has lost its connection to the heat sensor that measures the temperature of the water circulating to your radiators, so it has shut down to prevent overheating.. It appears on 4 Saunier Duval models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Central heating NTC not connected to pipe
Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Saunier Duval models that show the 19 fault code

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

Source

Saunier Duval 19 fault code information on this page is sourced and cross-checked against the official Saunier Duval service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026