F5 Low

Ferroli F5 Fault Code

The Ferroli F5 fault code means: your boiler has detected a temporary issue with the air vent or exhaust system and is pausing itself to stay safe, but it should restart on its own once the condition clears.. It appears on 5 Ferroli models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Temporary shutdown that is automatically reset as soon as the value causing the fault comes back within the boiler’s normal working range
Typical repair cost £100-250 (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 F5 fault code

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

Source

Ferroli F5 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