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No Central heating but still hot water?

We have a Ravenheat whitestar LS80T and we have no central heating but still have hot runing water, we have bought a new control board, but it still has not worked, what next?????
Lee Mason, October 2007
try htg sensor, they are approx £8

paul, October 2007
it is probably the 3 port valve is not changing over to heating when heating is called for

Trevor, October 2007
link Click here to see other fixes for Ravenheat.