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 begin sending warm air into the house. Finding the step that fails is most of the job. Around Dunwoody, GA, 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.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Dunwoody
The sooner you notice these red flags, the easier and cheaper the fix. Watch for these telltale signs:
- Booming or banging at light-off from delayed ignition
- A furnace that shuts off every few minutes before the house warms up
- Burners light, run a few seconds, then shut down repeatedly
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Rust streaks, soot, or water around the cabinet or flue
- The igniter glows and clicks, yet no flame ever appears
- The blower runs constantly but the air never warms
- Squealing or grinding from the blower compartment
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call (470) 200-3365 at the first sign of trouble.
