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hot water on,no heating-ravenheat combi csi85a(t)?

We have hot water,but no heating,all the lights are on correctly on the panel
sean, February 2011
Might be a faulty Diaphram. Had something very similar once.

sean, February 2011
check external controls are calling for heat check for voltage at the heating teminals of the pcb

brian, February 2011
link Click here to see other fixes for Ravenheat.