Why does the hot water on my Ravenheat boiler sometimes come out cool?
A Ravenheat 820/20 combi boiler, had diverter valve diaphragm replaced last year as it had perished, now occasionally it will only supply cool water either when central heating is on or off. When h/w is coming out cool the burner is lit, the diverter valve appears to be tranferred so where is the heat going?
Walt
February 2006
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