From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, everything happens in a strict order: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower moving heat through the ducts. Most of the diagnosis comes down to finding the broken link. In Lexington 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.
Signs You Need Furnace Repair in Lexington
Spotting the early warning signs lets you act before the problem gets expensive. Watch for these telltale signs:
- Booming or banging at light-off from delayed ignition
- Grinding or high-pitched squeals from the blower
- The furnace clicks and glows but the burners never light
- Rust streaks, soot, or water around the cabinet or flue
- Yellow, wavering burner flames where they should be sharp blue
- 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. Don't wait, call (859) 465-5428 and we'll take a look right away.
