Boiler lock out High

Ferroli Boiler lock out Fault Code

Also written as BOILERLOCKOUT — same fault.

The Ferroli Boiler lock out fault code means: your boiler has stopped working as a safety precaution and needs to be manually reset to try and restart the system.. It appears on 1 Ferroli model 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: Red lockout light illuminates. On/off/reset switch (3) should be turned to the reset position.
Typical repair cost £100-250 (including labour)

DIY fix possible

Locate the on/off/reset switch on the front control panel.Turn the switch to the 'reset' position and hold it briefly.Return the switch to the 'on' position and wait to see if the burner ignites.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ferroli models that show the Boiler lock out fault code

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

Source

Ferroli Boiler lock 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