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My heating and water boiler was replaced about 3 years ago and has been running fine until recently, when I am unable to run both at the same time. separately both work fine, if I switch on the HW then CH it will stay in the HW position, if I switch on CH then HW it will go to the CH position...

I have a metal soil pipe from the toilet going down the side of the house and joins onto a clay pipe just below ground level. Unfortunately when breaking up a concrete path I can now see a crack in the collar of the clay pipe. What is the best way to solve this. Any advise would be appreciated...