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ravenheat csi 85at?

Ravenheat CSI 85AT DHW comes on sometimes slightly better when CH on, fan ok, gas valve ok, DHW and CH sensors test at 12Kohms, diverter valve OK, how do I check the thermister and has anybody any solutions.
Jim, July 2012
most likely DHW diaphragm in divertor valve split

AWOL, July 2012
link Click here to see other fixes for Ravenheat.