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Sounds like a blockage or an air lock in feed or return ..... you could try closing both valves on the two existing and two new radiators, drain each radiator in turn then open the bleed valve, open one valve to half fill the radiator then close this valve and open the other, you should get an...

I'm not new to DIY, but this one has me beat! I have a Vailant VCW282E Combi boiler (sealed CH system), when the system switches on the central heating works fine, heats up, thermostat kicks in and out when required and the boiler responds accordingly. However, when I turn on the hot water...