Your boiler is operating normally and is currently sending 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: CH being supplied
What causes this fault?
This code appears when the boiler's internal controls detect a demand for central heating from your room thermostat or programmer. It indicates that the burner has ignited and the pump is successfully circulating hot water around your radiators. There is no fault present, as the boiler is simply confirming it is doing its primary job of warming your home.
You will see this code most frequently during autumn and winter when the outdoor temperature drops and your heating system is working regularly.
DIY fix possible
No action is required as this is a status indicator rather than a fault.If you want the heating to stop, turn down your room thermostat.If the heating stays on when the thermostat is off, contact a professional to check the diverter valve.
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A boiler cover plan would cover faults like C — no call-out fees, no surprises.
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