BoilerFaultCodesFerroli 23 Fault Code
The Ferroli 23 fault code means: your boiler is not receiving enough gas or failing to ignite, meaning it cannot produce heat or hot water.. It appears on 3 Ferroli models in our database.
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).
DIY fix possible
Check that your gas meter emergency control valve is turned to the fully open position.Verify the gas isolation valve located underneath the boiler is open.Check if other gas appliances in your home, such as a gas hob, are working to confirm gas supply.Press the 'Reset' button on the boiler control panel once.
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Gas Safe Register →Ferroli models that show the 23 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli 23 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