From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, everything happens in a strict order: 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 Milwaukee 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.
When to Call for Furnace Repair in Milwaukee
Catching these issues early helps you avoid costly problems. Keep an eye out for the following clues:
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A furnace that shuts off every few minutes before the house warms up
- Flames that start, last a few seconds, and go out again and again
- Yellow, wavering burner flames where they should be sharp blue
- A bang or boom when the burners ignite late
- A fan that keeps running while the registers blow cool air
- Squealing or grinding from the blower compartment
- Clicking and a glowing igniter with no burner flame
Don't Wait for a Total Failure
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. At the first hint of a problem, call (414) 432-4618 for a fast inspection.
