How much does it cost to fix Saunier Duval error code E01?

Typical repair cost for the Saunier Duval E01 fault is £120-250 including labour.

E01 High

Saunier Duval E01 Fault Code

Q: What does the Saunier Duval E01 fault code mean?

Your boiler is failing to light the internal flame, which means it has automatically shut down to prevent gas from building up safely.

The Saunier Duval E01 fault code means: your boiler is failing to light the internal flame, which means it has automatically shut down to prevent gas from building up safely.. It appears on 6 Saunier Duval models in our database.

Technical description: Faulty ignition (flame not detected)

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 E01 fault code

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

Thelia Repair: £120-250
Thelia 23E Repair: £120-250
Thema F 30 E Plus Repair: £100-350
Themaclassic F23E Repair: £120-250
Themaclassic F25E Repair: £120-250
Themaclassic Plus F30E Repair: £120-250

Source

Saunier Duval E01 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