You’re suspicious that there is something wrong with your central heating system and to be honest if the system is more than a few years old it probably does need at least some maintenance to eliminate any existing or potential problems inside it.

One of the more common problems with a central heating system is the issue of air getting trapped inside it. How can you tell if your central heating system has air trapped in some part of it? Well just like a human being with trapped wind the first sign of trapped air (or what’s called an air lock) in your heating system is that you’re going to hear a lot of noise – especially when you’re turning on the central heating system for the first time each day.

A trapped air pocket can cause banging noises to occur when your heating is being turned on and you’ll probably also notice similar types of noises when the system switches itself off again afterwards.

Another sign of there being at least some air trapped inside your heating system is the appearance of cold spots on the upper parts of your radiators – air is most likely to gather in this part the radiator because gas rises.

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