This could be due to a variety of reasons, there could be air in the system which will need to be removed, (See below, how do i bleed a radiator) or there could be debris in the system which occurs naturally when you have water travelling through a metal object. Both of these can make the boiler and radiators work less efficiently and effectively.
If after checking that there is no air in the radiators we would suggest that you give us a call so we can try and help you to find out why your radiators are no longer getting warm.
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