From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, the sequence is strict: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower moving heat through the ducts. Diagnosis is mostly a matter of finding where that chain breaks. In Green Bay homes, it tends to be the same handful of culprits: a flame sensor coated in oxide, a hot surface igniter cracked by thermal cycling, a pressure switch held open by a tired inducer or a plugged condensate trap, or a control board with a burned relay.
For air conditioning breakdowns, see AC Repair.
When to Call for Furnace Repair in Green Bay
Recognizing the warning signs early can save you time and money. Keep an eye out for the following clues:
- Repeated shutdowns just seconds after the burners light
- Squeals, scrapes, or grinding noises behind the blower door
- A furnace that shuts off every few minutes before the house warms up
- Yellow, wavering burner flames where they should be sharp blue
- Loud booms at startup caused by delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Air moving through the vents that never gets warm
- Rust streaks, soot, or water around the cabinet or flue
Act Before It Gets Worse
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Call (920) 516-9298 at the first sign of trouble.
