How much does it cost to fix Saunier Duval error code F0?

Typical repair cost for the Saunier Duval F0 fault is £120-200 including labour.

F0 High

Saunier Duval F0 Fault Code

Q: What does the Saunier Duval F0 fault code mean?

Your boiler is struggling to accurately measure the temperature of the water flowing through the system, so it has shut down to prevent potential damage.

The Saunier Duval F0 fault code means: your boiler is struggling to accurately measure the temperature of the water flowing through the system, so it has shut down to prevent potential damage.. It appears on 2 Saunier Duval models in our database.

Technical description: Flow thermistor fault

Typical repair cost £120-200 (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 F0 fault code

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

Thema F 30 E Plus Repair: £120-220
Themaclassic Plus F30E Repair: £120-200

Source

Saunier Duval F0 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