FH Low

Ferroli FH Fault Code

The Ferroli FH fault code means: your boiler is currently running an automated air purging cycle to remove trapped air bubbles from the system, which is a normal process after installation or maintenance.. It appears on 8 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: Heating system air venting cycle with fan operating

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 FH fault code

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

Source

Ferroli FH 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