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:cry:All been said before if the op wanted look

:mad:Well you can lead a horse to water and all that. But if they don't want to hear what we say we can't make them

Also likely to be not allow under water regs

Yes I've had the problem a few times with the grunny Alfa's and the larger commercial pumps we used to use on biomass systems. The instruction do tell you that the head has to be correct.

Make sure the pump is fitted with the head in the correct orientation as per in the instructions as condensation builds up and they fail, it may dry off if the cover was removed and a hairdryer used just a chance. Mark

Never seen one like that learn something new every day

Soz I ment phill

What DP said

Hi it seems like there's no cold main in your boiler house prob filling loop in house somewhere airing cupboard picks please ?

Ok best of luck let us know the out come

probably Dans right coil split in cylinder I take it the f&e tank is higher in the loft than the dhw header tank check the f&e tank overflow is not connected to the dhw over flow and backfilling from that. Cheers mark

Just a question do you have a thermal store ?

Hi new to this but just a thought BG may have connected the pipes wrong way round sending the flow up the vent as its a flat and not much head surprised they didn't close the system !