F7 Medium

Saunier Duval F7 Fault Code

The Saunier Duval F7 fault code means: your boiler is struggling to accurately measure the temperature of the hot water it is producing, so it has safely shut down the hot water supply to prevent overheating.. It appears on 3 Saunier Duval models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Domestic hot water sensor fault
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 F7 fault code

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

Source

Saunier Duval F7 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 31 August 2026