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 Kokomo, IN, 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.
Signs You Need Furnace Repair in Kokomo
The sooner you notice these red flags, the easier and cheaper the fix. Keep an eye out for the following clues:
- Burners light, run a few seconds, then shut down repeatedly
- Rust streaks, soot, or water around the cabinet or flue
- The blower runs constantly but the air never warms
- Booming or banging at light-off from delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Grinding or high-pitched squeals from the blower
- Yellow, wavering burner flames where they should be sharp blue
- A furnace that shuts off every few minutes before the house warms up
Act Before It Gets Worse
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Call (765) 202-5111 at the first sign of trouble.
