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Ferroli Optimax HE31c a26 problem?

I'm having A pressure issue. The system pressure will increase to over 2-3bar and shut off from a starting position of 1.2bar. If I start from a position of a half a bar then I can only set my temperature to around 50 degrees for the system to stay under 2bar and remain on????
Ron McDowell, December 2017
link Click here to see other fixes for Ferroli.