BoilerFaultCodesWarmflow Burner control box lockout light lit Fault Code
Also written as BURNERCONTROLBOXLOCKOUTLIGHTLIT — same fault.
The Warmflow Burner control box lockout light lit fault code means: your boiler's burner has stopped running for safety reasons, which usually means it tried to fire up but couldn't detect a flame.. It appears on 3 Warmflow models in our database.
Technical description: Burner lockout — fuel/electrical fault, failed component, or worn nozzle; press the reset button and investigate
DIY fix possible
Check that you have enough oil in your storage tankEnsure the oil supply valve is fully openPress the illuminated reset button on the burner control box onceIf the boiler fires and then cuts out again, do not continue resetting and call a technician
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Warmflow models that show the Burner control box lockout light lit fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmflow Burner control box lockout light lit fault code information on this page is sourced and cross-checked against the official Warmflow service / installation manuals for each affected model.
- Warmflow 70/90 Combi manual (PDF)
- Warmflow B-series and Bluebird manual (PDF)
- Warmflow Kabin Pak and Utility manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026