There are a few fairly easily detectable issues to look out for if your radiators aren’t heating up properly after summer, and finding them might save you a pretty penny in not actually needing the services of a professional heating engineer.
You should check for cold spots on a radiator, particularly towards the top, that would indicate sludge has formed in the system, and a radiator power flush could could be needed
If you notice cold spots on a radiator, especially towards the top, it would tend to indicate sludge is infiltrating the system. In such an instance, a radiator power flush is recommended. You can check if your downstairs radiators heat up while upstairs appliances stay cold, which would suggest a boiler pressure issue. And if your radiators are cold at the top but warm at the bottom, it is likely air locks have formed, and you need to bleed your radiator.
For further help and information about the best way to deal with radiators not working properly, browse our blog, Why are my radiators not heating up after summer?