5. Search for loose or broken links in the duct connections in your attic. A loose link could cause damage to the air balance of your home, not to mention the overall loss of your system’s performance. These are usually easily patched at your local hardware store with duct tape or duct...
Another option is to remove the check valves before you winterize the system, however this is a lot of work. The check valves trap the water in the pipes and the sprinkler heads where it will freeze and break the pipes and the sprinkler heads....