Getting to Know the 3100 15q108 Contactor

If you're staring at a dead AC unit and wondering if the 3100 15q108 contactor is the culprit, you aren't alone. It's one of those parts that nobody ever thinks about until the house starts getting stuffy and the outdoor unit refuses to kick on. These little components are essentially the gatekeepers of your HVAC system, and while they look simple enough, they do a lot of heavy lifting to keep your home cool. ...

April 25, 2026 · 6 min · Overlock Schweizer