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Ravenheat RSF 100ET dhw ?

domestic hot water goes hot then cold, central heating works ok, 3 way valve appears to be working ok. where would the thermistor be located that controls the temperature?
Terry, January 2010
heat exchanger also reqd a sonic clean due to scaling have since fitted hydroflow hs38 to coldwater feed

terry, March 2010
Fault proved to faulty sensor on the DHW outlet pipe

terry, January 2010
link Click here to see other fixes for Ravenheat.