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 Hendersonville, TN, 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.
When the AC quits in summer, see AC Repair.
When to Call for Furnace Repair in Hendersonville
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- Short cycling every few minutes without reaching the setpoint
- A fan that keeps running while the registers blow cool air
- A flame that burns soft and yellow rather than steady blue
- Squeals, scrapes, or grinding noises behind the blower door
- Loud booms at startup caused by delayed ignition
- Rust streaks, soot, or water around the cabinet or flue
- Clicking and a glowing igniter with no burner flame
- Repeated shutdowns just seconds after the burners light
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Don't wait, call (615) 537-0370 and we'll take a look right away.
