BoilerFaultCodesWhat the manual says
Manufacturer manualBurner Lit
From this model's manual
Verified against the Micron 80ff installation & service manual.
What causes this fault?
This is not a fault, but a status indicator showing that the gas valve has opened and the main burner has successfully ignited. It confirms that the internal components have completed their safety checks and the unit is now actively generating heat for your radiators or hot water. If the light is on, your boiler is functioning exactly as it should be.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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All 17 fault codes on the Micron 40FF
Seeing a different code? Every code this model can display, in one place.