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I turned the pump speed down from 3 to 2 and no probloms since thanks for the help.

Yes i have bleed the pump. What has me puzzled is that everything works fine when all the trv's are set at the highest, for 3 days i had the heating on with no probs. Buts whats the point of having trv's when there set at the highest so i turned them down to setting 3 (19 to 21 degrees). It...

Can anyone Help? I have fitted trv's to all of the rads in my house (11 rads) and i fitted an auto bypass valve between flow and return of boiler with a .2bar setting. I had all the valves at the highest setting to bleed system. I turned on heating and all the rads heat up no probloms at all...