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How can I fix my Ferroli Optimax HE 31C?

I have hot water but radiators won't fire up.
Derek Judge, April 2011
diverter vavle gets stuck in hot water position and some times other way round. can free them somtimes by taking them out and winding it by hand but my advice, while its out change it.

butlerplumbing, April 2011
link Click here to see other fixes for Ferroli.