F04 High

Ferroli F04 Fault Code

The Ferroli F04 fault code means: your boiler's internal computer has lost its configuration settings and no longer knows how to operate the heating system correctly.. 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: Wrong card parameter setting
Typical repair cost £100-280 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ferroli models that show the F04 fault code

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

Source

Ferroli F04 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 27 April 2026