Making sense of your millivolt gas valve wiring diagram

If you're staring at your gas fireplace or wall heater and wondering why it won't kick on, you probably need a clear millivolt gas valve wiring diagram to sort out the mess of wires tucked under the burner. It's one of those things that looks incredibly intimidating at first glance—lots of copper leads, tiny screws, and thin wires—but once you break it down, it's actually one of the simplest electrical circuits you'll ever encounter in your home. ...

February 16, 2026 · 7 min · Thalji Iglesias