If you’ve noticed that some of your radiators aren’t heating up as well as they used to, there are a couple of common causes to consider. Radiators that feel cold at the bottom, have cold patches, or don’t distribute heat evenly often suffer from trapped air or a build-up of sludge inside.
If air has accumulated in your radiators, the problem can usually be fixed by bleeding them, a simple task that releases the trapped air. Be sure to have a cloth handy to catch any water that may escape during the process.
If bleeding the radiators doesn’t solve the issue, it’s likely that sludge build-up is to blame. Over time, rust and debris can collect in the heating system, forming a thick, brown substance that blocks the flow of hot water. If you suspect sludge is present in your radiators, it’s best to contact a qualified heating engineer for professional help.
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