So first I thought my thermostat for 1 zone was bad. Now, it looks like the thermostat wasn't the problem, but something else is fishy. I discovered that in my 1st floor, the heat wasn't shutting off. I went to check the taco valves, and found that on one zone, the taco lever was set to "open" so I closed it. The heat in the living room seemed to dissipate. On the third floor, where I was originally having problems, I was getting heat in 1 room, but not another and they are supposed to be in the same zone. Now, when I try to bleed that zone, nothing comes out except a short trickle of water. This is new, and I don't know if it's related to me touching the taco valve, which I thought was on another zone. Does anything here sound familiar, any tips you guys can give? Thanks!