BoilerFaultCodesYour boiler is currently firing up and running as it should to provide heating or hot water, so this is a status message rather than a fault.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: burner on
What causes this fault?
This code appears when the boiler's internal computer has successfully ignited the burner to meet a demand for heat. It signifies that the gas valve has opened and a flame is present, confirming that the system is operating exactly as intended. There is no physical fault or blockage causing this display; it is simply the boiler communicating its current activity.
DIY fix possible
Check your thermostat to see if it is calling for heatMonitor the display to see if the code changes to '0' when demand endsNo action is required as this is normal operation
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A boiler cover plan would cover faults like S.14 — no call-out fees, no surprises.
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