How much does it cost to fix Saunier Duval error code Overheating safety?

Typical repair cost for the Saunier Duval Overheating safety fault is £120-250 including labour.

Overheating safety High

Saunier Duval Overheating safety Fault Code

Q: What does the Saunier Duval Overheating safety fault code mean?

Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety issues.

Also written as OVERHEATINGSAFETY — same fault.

The Saunier Duval Overheating safety fault code means: your boiler has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety issues.. It appears on 1 Saunier Duval model in our database.

Technical description: In the event of a problem, the overheating safety devices cause safety shutdown of the boiler.

Typical repair cost £120-250 (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 Overheating safety fault code

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

Sylva Repair: £120-250

Source

Saunier Duval Overheating safety 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