Every time your thermostat calls for heat, the furnace runs 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 Normal, IL, the usual failure points are an oxide-coated flame sensor, 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.
Cooling trouble instead? See AC Repair.
Warning Signs for Furnace Repair
Catching these issues early helps you avoid costly problems. Here are the most common indicators that it's time to call a professional:
- Air moving through the vents that never gets warm
- Loud booms at startup caused by delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Grinding or high-pitched squeals from the blower
- Repeated shutdowns just seconds after the burners light
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A flame that burns soft and yellow rather than steady blue
- A furnace that shuts off every few minutes before the house warms up
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. Call (309) 290-9444 at the first sign of trouble.
