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Many thanks Andygasman2010
I had kind of come to this conclusion myself but couldn't quite believe two units could have exactly the same faulty, especially one being a new one. Just wanted to see if anyone had any other thoughts before I blew another 60 odd quid.
Thanks again everyone.
The doesn't appear to be a by pass but there is an expansion unit. This is working as you can here water being discharged into the header tank when the problem occurs. Thanks.
Hi, the pump is wired back to the boiler. Heating and hot water work fine except for the banging noise when either the roomstat reaches temp or the timer swithes the whole system off. Thanks.
Hi, I have a problem with an old Glow Worm Fuelsaver 80F - circa 1988.
Whenever the timer switches the system off or the room stat reaches temperature there is a load banging noise followed by a discharge into the header tank via the expansion system. However the noise does not occur when the...