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B&Q DIY Warehouse › B&Q Power Tools › › B&Q Online Warehouse - The UK DIY Website › B Q Warehouse › B Q Diy › B Q Stores › Diy › B Q UK › Bq › Website B Q › Diy Stores › B Q Ireland › Bq DIY › B Q › B Q UK › B Q Diy Store › Bq › B Q Diy Shop › Bq Diy › B Q Diy Uk › DIY › B Q DIY Merchants › B Q Warehouse › B Q Home Improvement › www.bq UK › www.bq.com › B&Q Warehouse › B&Q Diy › B&Q Stores › Diy › B&Q UK › Bq › Website B&Q › Diy Stores › B&Q Ireland › Bq DIY › B&Q › B&Q UK › B&Q Diy Store › Bq › B&Q Diy Shop › Bq Diy › B&Q Diy Uk › DIY › B&Q Diy Merchants › B&Q Warehouse › B&Q Home Improvement › › B&Q UK DIY › www.bq UK › www.bq.com › B&Q Online DIY Shop › Website B&Q DIY. Home | Sign In | Find a B&Q | About B&Q | Help Your Basket Items 0 Sub-Total £ 0.00 Delivery £ 0.00 Total £ 0.00 Advice Building Gardening Decorating and Design Carpentry Plumbing Electrical Reference Buyers Guides DIY Glossary Calculators We hope this helps to answer your question. If you require further help please return to the Advice section When I switch on my central heating the water gets hot but the radiators do not. Can you help? Back to list of Questions & Projects There are various aspects of your central heating system that could be at fault. The following is a checklist that you will need to go through: 1. Is the thermostat set to the current room temperature or above? Do not forget that an outside temperature of 15-20ºC dictates that your room temperature should be set at approximately 25ºC. 2. Have you got thermostatic valves on your radiators? If so check that they are not sticking. To do this you will have to take the head off and make sure that the pin is moving freely. 3. Is your pump working correctly? 4. Has your central heating system been cleaned recently? If not sludge could have collected in some important areas and this causes a blockage. 5. Have you tried bleeding the radiators? Air may have got into the system and have collected in all of the radiators. B&Q stock the products for cleaning and protecting your central heating system, Fernox products being excellent for this job. About B&Q | Privacy | Security | Terms | Copyright | Delivery . Online shopping at B&Q DIY (UK) is affordable, easy and 100% secure.