I've lived here 3 years. When I moved in they got warm... but not hot.
I've neglected to have it put right since then because of not having the money to sort it. By last winter they were completely cold, and they still are now.
In that case you have a blockage at the manifold, your plumber will find this easily. Its under the floorboards upstairs.
He will need to pull back carpets and lift floorboards to find, looking at around half a day plus fittings.
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