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Viega zone power heads

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rich p_4
rich p_4 Member Posts: 25
in THE MAIN WALL
I am having some trouble with the powerheads
when tightned they do not draw current (they dont open)
if I loosen them they will open. But it seems really loose
Is this normal, I have used them before has anything changed? I also have a weird problem withthe tstat they are connected to- the display goes blank sometimes? 2 different tstats same zone??
thanks for any insight
Rich
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