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Ravenheat boiler?

My Ravenheat boiler won't fire up when set to hot water only, meaning that, in summer, I have to waste fuel in turning the heat on for a while. This was rectified a year or so ago but the problem has returned

David White
June 2008
RavenheatHeating, Home Heating SystemsBoiler Water Meaning
problem is with the dhw flow switch, it may need replacing, or getting crudded up due to hard wter and scale in your area

T
June 2008

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