Worcester Boshh 240 central heating combi. 7 rads, central heating has no problem. Hot water showing small black dots when you fill bath, these dots are like oil granules!! I think maybe the diaphram is breaking down also there is a reducer pipe from the water tank to the diaphram housing which has a small leak in it, one drip every 2 minutes, i need this pipe its about 5cm long, i can get this i think locally. Now the reason i think the diaphram housing is going down is because sometimes when you turn on the water the 2 microswitches are not make being switched so the water runs through cold, then other times it runs hot. please advise.
thanks
pete
thanks
pete