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wirsbo telestat question

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rod robbins
rod robbins Member Posts: 50
in THE MAIN WALL
Hello
I have been seeing one bathroom zone has been running a lot and today i notice, on the wirbo zone control module,that the thermostat wasn't calling for heat and the telestat looked stuck and the system was still running.There are 6 of these on one zone.They are the slow type so i went upstairs to look at the manifold to see if it was in the open position.It looked closed but was still calling for the system to run so i tapped it a few times and it shut off.My question is do these stick sometimes?Am i correct to asume that if the telestat end switch is closed that the valve is open and the zone is basicly running away?Do these sometimes stick with the valve closed and no heat running thru the valve but the system is running?
This is my first problem.Up till now running great.
Thanks guys
Rod
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