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not sure what would it look like? and be located is it like a gate valve or the isolation valves with the flat head screwdriver thing? Do not have a clue where it would be. Would a microbore system have one of these. Thanks again

The pump was changed last night for a grunfoss and is the right way round. cheers

cheers mate will test and chop accordinly, I can sort if hear it struggling through the seperator.

Hi I have 18 year house with Netaheat boiler located downstairs, at present I my rads upstairs get hot after about 1/2 hour and downstairs get no heat at all. I have checked they are all turned on. My mate came round late last night and changed the pump but there is no change. The system...