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 Georgetown, TX, 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.
Signs You Need Furnace Repair in Georgetown
Recognizing the warning signs early can save you time and money. Keep an eye out for the following clues:
- Squealing or grinding from the blower compartment
- Frequent on-off cycling that never reaches the thermostat setting
- Yellow, wavering burner flames where they should be sharp blue
- Clicking and a glowing igniter with no burner flame
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Flames that start, last a few seconds, and go out again and again
- Booming or banging at light-off from delayed ignition
- A fan that keeps running while the registers blow cool air
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 (737) 344-9568 for a prompt inspection.
