Are your radiators hot at the bottom and cold at the top? This is a sign that your radiators will need bleeding. The cold patches are caused by air being trapped inside the radiator, and getting rid of it is relatively straightforward. You won’t need an engineer to come out to fix this as it’s something that you can easily do yourself. It’s really quick and simple to do and to help, we’ve prepared a step-by-step guide.
Automatic bleed valve
If you have a combi boiler or sealed system, you may need to repressurise your boiler after bleeding the radiators.