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yes we have done this and they also heat up we have gone round styme turnin each one on and off they all work? we curently have 3 workin any more and they go cold?

we have a vaillant combi boiler 824e and the rads are cold the out pipe seams hot but the return pipe is cold, somebody said the pump but have taken it apart and seams to be workin have beld rads for air lock??????? any ideas welcome / how do you know if pump is broken even if still pumpin?( can...