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If your boiler is working but your radiators are not heating up enough and you cannot heat up your house, there may be several reasons for this. 1. If your boiler filter is clogged, it will not heat. 2. If the system is dirty, it will not heat. 3. If the circulation motor is faulty, it will not heat. 4. If there is no air in your expansion tank, it will not heat. 5. If the system is clogged, it will not heat. How to repair the boiler recirculation engine, how to maintain it all in this video