Your boiler is currently stuck in a manual test mode used by engineers to check emissions, meaning it won't respond to your normal heating settings.

DIY fix possible

Locate the button with a chimney sweep (small brush) icon or 'Test' button on the control panel.Press and hold the button for a few seconds until the light or code disappears.Switch the boiler off at the fused spur switch for 30 seconds and turn it back on to reset the software.