Right, it was unbelievably loud earlier so I whipped off the front cover to try and locate the noise, it was coming from behind the second cover with the window in......so :shock: I whipped that off too!!
As I was undoing the screws I could feel the air being sucked in ( :oops: Yes, it was...
Thanks guys, Im inclined to think the noise is the fan as it sounds like its coming from the very top of the boiler.
Im going to change the diverter valve and diaphragm assembly as a whole, its only a tenner more than just the valve!
Then Ill address the problem with the pressure dropping...
We have a Baxi Eco 80 Combi, that when the CH comes on it howls really loud, the system has been bled and the pump has been bled too. When the DHW is turned on it also brings on the CH! I know this is probably the 3-way valve, but when the DHW is turned off the boiler groans once more!!
The...