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Saunier duval F23E?

I have saunier duval f23e boiler and when the heating is off , the radiarors get hot when we use hot water.
Dave, December 2011
Washers or rubber pads on diverter valve arm worn or lost.These can be replaced without removing the valve.

alan, February 2012
have same boiler and same problem a while back, changed diverter valve and fitted new water valve at same time and problem solved.

David, December 2011
link Click here to see other fixes for Saunier Duval.