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 sending heat through the house. Most of the diagnosis comes down to finding the broken link. In Michigan City 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.
When the AC quits in summer, see AC Repair.
Signs You Need Furnace Repair in Michigan City
Recognizing the warning signs early can save you time and money. Here are the most common indicators that it's time to call a professional:
- Booming or banging at light-off from delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- A furnace that shuts off every few minutes before the house warms up
- Repeated shutdowns just seconds after the burners light
- Air moving through the vents that never gets warm
- Water, rust stains, or black soot around the flue or cabinet
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Squealing or grinding from the blower compartment
Don't Wait for a Total Failure
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. If you notice any of these signs, call (219) 202-9131 for a prompt inspection.
