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Mend Ravenheat 820/20 Boiler Central Heating Combi

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
RavenheatRavenheat 820/20Heating, Home Heating SystemsBoiler Central Heating Combi
if the d/valve is ok and the burner is firing for hw-check the hw pipe comming out of the bottom of the boiler next time it happens -if this pipe is roasting and the water out your taps is cool then one of ur mixer taps or shower is faulty-the cold mains is diluting the hw and cooling it down.

stevie
February 2006

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Ravenheat 820/20 Cool Water - Common Issues