Hello chaps and chapesses. Had my old myson pump that sounded like a bag of hammers replaced by the local plumber who is a CH engineer. Had to go on holiday so never had a chance to test it. Radiators not getting hot at all and some clay cold. As I'm a diy-er - flushed out the system and currently have some x400 cleaner in. Surprisingly discovered that the pump may be installed in the wrong orientation - but don't know if this will affect the pump efficiency. Water direction is corrrect but I can only get any 2 radiators hot. Output from the boiler is 70ishc return is 15ish. No probs with hot water. F&E Y system I think (to tanks in the loft 1 diverter (working ok i think) (possible diverter valves bunged up?) Help!! Could I have some votes please?