If your boiler is working but the radiators are still cool then the likely cause is a faulty boiler pump or your central heating controls.
Faulty pump
You may be able to check whether your pump is working. If it isn't then you'll need a Gas Safe Register approved engineer to repair or replace it.
Faulty pump thermostat or timer
Double check that the thermostat or timer is working correctly. If they need replacing you'll need a Gas Safe Register approved engineer.
Air pockets in the system
You may have air in your system. You can tell when this is happening because your radiators will go cold alternately as the air pockets move around the heating system. Try bleeding the radiators first before getting in professional help.
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