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Home How-to Guides

Boiler works but radiators stay cold

Laura Rudd by Laura Rudd
09/10/2017
in Boiler, DIY, Home heating guides, How-to Guides, Radiators
7.2k 457
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Boiler works but radiators stay cold - man turning on radiator valve
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If your boiler works but your radiators stay cold, here’s what to do…

Things to check on your boiler

  1. If your boiler works but the radiators are not heating up, then likely cause could be a faulty boiler pump or your central heating controls.
  2. If your boiler works but the radiators are cold, check that the thermostat or timer is working correctly. If they need replacing you’ll need a registered heating professional to carry out the work.

The thermostat or timer is faulty

Double-check that the thermostat or timer is working correctly. If you find a fault, contact your local heating engineer to arrange for a replacement to be installed.

There are air pockets in the system

You may have air in your system if your radiators are staying cold. You can tell when this is happening because your radiators will go cold alternately as the air pockets move around the heating system. See our article on how to bleed a radiator first, before getting in professional help.

Blockages and debris within system

Your heating may also be contaminated with debris or sludge, this can inhibit circulation and cause radiators to not heat up correctly. If you’re not confident that you’ll be able to resolve this, it might be time to call in a Gas Safe Registered Engineer.

The pump is faulty

If you have tried all of the above and our guide to diagnosing central heating problems hasn’t helped, it might be that your circulation pump is faulty. If this is the case, you’ll need to call a registered heating professional to repair or replace it.

Still having heating problems?

If you need a one-off repair to fix the cold radiators in your home, you can count on our expert repairs team to get things working again in no time.

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Tags: Radiators and Heating Help
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Laura Rudd

Laura Rudd

Proud mother to two boys, an avid DIY-er and interior design fan. Laura is always busy writing about ways to make everyone's lives easier - whether it's the odd how-to guide, life hack or general home inspiration.

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Related posts

  • What type of shower works best with a combi boiler?
  • Why is my radiator cold? Common reasons why radiators are…
  • How to balance radiators
  • Why are my radiators hot when the heating is off
  • How to fix a cold radiator
  • How to prevent cold weather damage

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