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Hi, When we turn the shower on , there is no dhw.If we then turn on the sink hot tap aswell as the shower , it fires up ! I looked at the plunger on the diverter valve , and it only comes out about half way when the shower is turned on , then when I open the sink hot tap , it pushes out fully...

Hi, first time user , hope someone can help me. About 18 months ago when the summer came , I switched over from heat and water to just hot water , and found that the water from the taps would not get hot ! I switched back to heat and water and turned the taps on and it heated up fine ! So to...