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Ok I have changed the diverter valve and still have this problem.The original had leaked a bit and was very stiff to move. When you turn on the hot water the motor moves as it should but is very very weak. Running through the diagnostics the screen says that the valve is in its correct...

I get the f75 fault on an ecotec plus 837 so after reading many posts on here decided to bite the bullet. I drained down the boiler and repressured the expansion vessel up to .9 bar as per instructions in book.I thought I'd take a look at the pressure sensor but coulbn't get the ruddy thing out...