25 High

Ferroli 25 Fault Code

The Ferroli 25 fault code means: your boiler is trying to start but cannot detect a flame, meaning it is currently unable to provide heating or hot water.. It appears on 3 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: Boiler failed to light. Make sure that the gas isolation valve on the boiler and on the gas meter are open. Press the RESET button (2 Fig. 1).
Typical repair cost £120-250 (including labour)

DIY fix possible

Check that your gas supply is turned on at the meter and the boiler isolation valve.Ensure any other gas appliances are working to rule out a main gas supply issue.Press the reset button on your boiler control panel once to see if it restarts.

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Ferroli models that show the 25 fault code

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

Source

Ferroli 25 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