BoilerFaultCodesYour boiler is working normally and is currently firing up to provide hot water for your taps or showers.
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 is a status code rather than a fault, appearing when you turn on a hot tap or start a shower. It indicates that the boiler has successfully detected a demand for water and has lit the burner to begin the heating process. You will see this code briefly every time the boiler is actively working to provide hot water to your home.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like S.04 — no call-out fees, no surprises.
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