Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
My Taco 219 Flo-Chek to prevent gravity flow is stuck in the closed position when the zone is calling for heat so I am not getting any heat in the rooms serviced by that zone. How can get it unstuck? the chrome splined thumb screw on the top can be backed out. I believe this is intended to allow for gravity feed if power goes out and the circulator won't operate. Am I right? How far can I back out that thumbscrew? Will I get a leak if I back it out all the way? Can it be removed and cleaned to allow it to move freely? Do I need to drain that zone in order to work on the Flo-Chek?