Underfloor heating zone valve stuck closed

Joined
17 Sep 2007
Messages
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Location
Oxford
Country
United Kingdom
I've a underfloor wet system, ICC with about 7 zones. 2 are stuck closed so the return pipe to main control point is cold, but the outgoing pipe is hot. Have tried turning knob but no change. And by the way the floor is cold. Any suggestions please?
 
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