BoilerFaultCodesFerroli Boiler locked-out Fault Code
Also written as BOILERLOCKEDOUT — same fault.
The Ferroli Boiler locked-out fault code means: your boiler has shut itself down as a safety precaution and needs a manual reset to try and start up again.. It appears on 1 Ferroli model in our database.
Technical description: Check if the gas isolation valve upstream of the boiler and on the counter are open. Turn knob “A” Fig. 1 to “Reset” and then release it.
DIY fix possible
Check that the gas supply valve near the boiler and your gas meter are both in the 'on' positionLocate the reset knob labeled 'A' on the boiler control panelTurn the knob to the 'Reset' position, hold briefly, then release it to allow the boiler to attempt ignition
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Gas Safe Register →Ferroli models that show the Boiler locked-out fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli Boiler locked-out 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