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raven heat boiler LS80T wont heat water up unless the centrol heating is on?

Hi i have a raven heat boiler/the white star LS 80T The fan is making a slight noise and wont heat the water up unless i turn the centrol heating on as'well.
My question ?
do i change the fan and qwere would i get 1 from

thank you..
dave edwards, May 2009
is the ls80t not a dual pass main exchanger??? i thought it was, and if right that would be flow switch problem

z, May 2009
Nothing wrong with the fan looks like a faulty divertor valve. Buy from the internet if you want it cheap and dont mind the wait.

j, May 2009
link Click here to see other fixes for Raven Heat LS80T.