A modern furnace runs a strict startup sequence, and knowing where the sequence breaks is most of the diagnosis. The thermostat calls, the inducer motor spins up to prove draft through a pressure switch, the hot surface igniter glows, the gas valve opens, the burners light, the flame sensor confirms fire, and only then does the blower deliver heat to the house. In Augusta, GA, the failures cluster at predictable points: an oxide-coated flame sensor, a hot surface igniter cracked from years of thermal cycling, a pressure switch that will not close because the inducer is weak or the condensate trap on a high-efficiency model has clogged, or a control board with a burned relay. Each one stops the sequence cold, and each one mimics the others from the hallway.
For air conditioning breakdowns, see AC Repair.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time and money. Keep an eye out for the following clues:
- Squeals, scrapes, or grinding noises behind the blower door
- The blower runs constantly but the air never warms
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Clicking and a glowing igniter with no burner flame
- Burners light, run a few seconds, then shut down repeatedly
- Frequent on-off cycling that never reaches the thermostat setting
- A bang or boom when the burners ignite late
- A flame that burns soft and yellow rather than steady blue
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 (706) 203-3391 for a prompt inspection.
