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ravenheat rsf 820/20?

can any one help me please on my ravenheat rsf 820/20 i have no hot water but i got heating can any one tell me what to do please thanks steve
stephen, March 2009
diverter valve diaphram replacement part costs about £20

stuart j, December 2013
where will i find the switch please thanks for your help steve

stephen, March 2009
there is a micro switch on the end of the diverter valve this may not be working, with the hot water running manually push the switch. try this first.

Ben, March 2009
link Click here to see other fixes for Ravenheat.