Fan Hunt High

Saunier Duval Fan Hunt Fault Code

Also written as FANHUNT — same fault.

The Saunier Duval Fan Hunt fault code means: your boiler's air extraction system is struggling to maintain a steady speed, which prevents the unit from starting or running reliably.. It appears on 1 Saunier Duval model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Fan speed fluctuation. Replace printed circuit board.
Typical repair cost £250-450 (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 Fan Hunt fault code

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

Source

Saunier Duval Fan Hunt 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 7 July 2026