Your boiler is not receiving enough gas or is struggling to light the flame needed to heat your water and radiators.

DIY fix possible

Check that your gas emergency control valve is open and any prepaid gas meter has credit.Ensure other gas appliances, like a hob, are working to confirm gas supply to the property.If it is freezing outside, check if your external condensate pipe has frozen and gently thaw it with warm water.Press the Reset button for five seconds to attempt to restart the boiler.