The boiler did this right after the new heat exchanger was fitted (less than 6 months ago). I have also drained and refilled the central heating twice (the water comes out pretty clear now). I am not sure how to drain the hot water side??
I have just checked: when I turn the hot water on, the...
I am hoping someone can help..? My Vailant Ecomax combi bolier kettles when the hot water comes on, on the timer or when we run a bath/shower. It only comes on with the hot water, not the central heating. When it starts making the noise, I can make it stop by turning the heating on with the...