BoilerFaultCodesYour boiler is currently operating normally and is providing heat to your radiators.
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: Boiler in heating mode / troubleshooting start state.
What causes this fault?
This is not actually a fault, but a status indicator showing the boiler is working as intended. It occurs when the central heating timer or thermostat calls for heat, signaling the internal components to begin the combustion process for your radiators. This light simply confirms the boiler has successfully fired up and is currently in its normal heating cycle.
This status is most frequently seen during autumn and winter when the heating is programmed to run for extended periods.
DIY fix possible
Check that your thermostat or programmer is set to the temperature you wantOpen all radiator valves fully to ensure heat is circulatingNo action is required if your heating is working as expected
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 Green LED flashing (1 second on, 1 second off) — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Mini HE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.