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How to Fix a Cold Radiator


The main function of any radiator is for it to heat a space to a nice, warm temperature, but what would happen if your radiator refuses to heat up?

Now that it is getting colder, you want your home to be warm and cosy and for it to stay that way through Winter, so knowing how to fix any little issue with your heating will mean that your home can stay warm without having to pay for an expensive engineer.

There are a couple of different facts that could make your radiators become cold, so we have put together a useful list of tips to help solve your cold radiator problems to help you save money!

Why is my Radiator Cold at the Top?

You might have air trapped in the system if you find that your radiator is heating up at the bottom but remains cold at the top. Due to this air the hot water at the bottom of your radiator will be unable to reach the top until the blockage is removed.

This is a simple fix which includes bleeding the radiator to remove any air that has been trapped inside.

How does Air get Trapped in my Radiator?

There are a few reasons on finding air trapped in your central heating system, and the most common reason is that it will find its way into one of your radiators and turns that area that into a cold spot. You might even hear the air banging around in your pipework, but it can be tough to diagnose how it got there and why.

The main causes of finding air in your central heating system…

  • If your central heating pump is installed above your supply tanks.

  • If your system has an open tank in the loft, this is used for immersion heaters.

  • A build-up of hydrogen in the heating system, this is caused by rust or sludge.

  • Small pink-hole leaks in the system, this means you will need to regular top up your boiler pressure.

Why is my Radiator Cold at the Bottom?

If you have a radiator that is cold at the bottom and not the top, then it is more difficult to resolve than just realising trapped air. The problem is usually caused by a build-up of radiator sludge at the bottom of the radiator which prevents the hot water reaching every column of the radiator. Radiator sludge is a mixture of different things that are floating around the water in your central heating system, this could include dirt, rust and iron oxide and hydrogen build-up, these can begin to interfere with the flow of water through the system and then settle at the bottom of your radiator.

If your radiator has a heavy build-up of radiator sludge or other contaminants it can make heating your room difficult as well as increasing your heating bills! If you don’t realise that this is happening, and you have a system with a big sludge build-up then it can cause severe damage to the rest of your central heating, so you need to fix this problem as soon as you can.

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