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 Alton, 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. Any one of them halts the startup, and from the hallway they all look alike.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Alton
The sooner you notice these red flags, the easier and cheaper the fix. These are the signals our technicians see most often:
- Loud booms at startup caused by delayed ignition
- Rust streaks, soot, or water around the cabinet or flue
- The furnace clicks and glows but the burners never light
- Yellow, wavering burner flames where they should be sharp blue
- Squeals, scrapes, or grinding noises behind the blower door
- Repeated shutdowns just seconds after the burners light
- The blower runs constantly but the air never warms
- Short cycling every few minutes without reaching the setpoint
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Call (618) 450-7978 at the first sign of trouble.
