F20 High

Ferroli F20 Fault Code

The Ferroli F20 fault code means: your boiler's computer has detected an internal error in its configuration settings, causing it to stop operating until the software is correctly reset or updated.. It appears on 6 Ferroli models 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: PCB parameter fault
Typical repair cost £150-300 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ferroli models that show the F20 fault code

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

Source

Ferroli F20 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026