From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, the sequence is strict: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower moving heat through the ducts. Diagnosis is mostly a matter of finding where that chain breaks. In Alpharetta homes, it tends to be the same handful of culprits: a flame sensor coated in oxide, a hot surface igniter cracked by thermal cycling, a pressure switch held open by a tired inducer or a plugged condensate trap, or a control board with a burned relay.
For air conditioning breakdowns, see AC Repair.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- Yellow, wavering burner flames where they should be sharp blue
- Rust streaks, soot, or water around the cabinet or flue
- Short cycling every few minutes without reaching the setpoint
- The furnace clicks and glows but the burners never light
- Flames that start, last a few seconds, and go out again and again
- Air moving through the vents that never gets warm
- A bang or boom when the burners ignite late
- Squeals, scrapes, or grinding noises behind the blower door
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Call (470) 200-3255 at the first sign of trouble.
