How much does it cost to fix Saunier Duval error code F (Ignition fault shown)?

Typical repair cost for the Saunier Duval F (Ignition fault shown) fault is £150-250 including labour.

F (Ignition fault shown) High

Saunier Duval F (Ignition fault shown) Fault Code

Q: What does the Saunier Duval F (Ignition fault shown) fault code mean?

Your boiler is failing to light the internal flame needed to heat your water and home.

Also written as FIGNITIONFAULTSHOWN — same fault.

The Saunier Duval F (Ignition fault shown) fault code means: your boiler is failing to light the internal flame needed to heat your water and home.. It appears on 1 Saunier Duval model in our database.

Technical description: The green running light will change to a red flashing light and the display will flash the letter ‘F’ with the type of fault. (Ignition fault)

Typical repair cost £150-250 (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 F (Ignition fault shown) fault code

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

Thema F 30 E Plus Repair: £150-250

Source

Saunier Duval F (Ignition fault shown) 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