Technical description
Unit is in operation for central heating
What causes this fault?
This code appears when you turn your thermostat up and the boiler begins heating the water for your radiators. It is a status indicator rather than a fault, showing that the internal pump and burner are active to meet your heating demand. As long as your radiators are getting warm, the boiler is performing exactly as intended.
This code is most frequently seen during the autumn and winter months when households begin using their central heating regularly after the summer break.
DIY fix possible
No action is required as this is a status indicator rather than a fault.Adjust your thermostat if you wish to stop the heating.Check your programmer settings if the heating is on when you do not expect it to be.