Every time your thermostat calls for heat, the furnace works through a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower start pushing warm air into the house. Finding the step that fails is most of the job. Around Flint, MI, the usual failure points are a flame sensor fouled with oxide, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Each one halts the startup, and from the hallway they all look alike.
When the AC quits in summer, see AC Repair.
Signs You Need Furnace Repair in Flint
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- A bang or boom when the burners ignite late
- Rust streaks, soot, or water around the cabinet or flue
- A fan that keeps running while the registers blow cool air
- Squealing or grinding from the blower compartment
- Repeated shutdowns just seconds after the burners light
- Yellow, wavering burner flames where they should be sharp blue
- A furnace that shuts off every few minutes before the house warms up
- The furnace clicks and glows but the burners never light
Early Action Saves Money
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. If you notice any of these signs, call (810) 204-4345 for a prompt inspection.
