Hi. I have a problem. My Tarm 60 is almost done with a full burn and my tanks are charged to 185. The problem is my house forced air zone wont shut off. The zone is supplied by a zone valve and grunfos Alpha. I have the Taco zone valve control box with a Relay ( I dont know much about the electrical controls). The little red light on the relay is staying on. House is now up to 72 degrees and climbing with the stat set at 68. Any thoughts?