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 sending heat through the house. Most of the diagnosis comes down to finding the broken link. In Cedar Park 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.
Cooling trouble instead? See AC Repair.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time and money. Keep an eye out for the following clues:
- Loud booms at startup caused by delayed ignition
- Repeated shutdowns just seconds after the burners light
- Short cycling every few minutes without reaching the setpoint
- Grinding or high-pitched squeals from the blower
- Yellow, wavering burner flames where they should be sharp blue
- Rust streaks, soot, or water around the cabinet or flue
- Air moving through the vents that never gets warm
- The igniter glows and clicks, yet no flame ever appears
Don't Wait for a Total Failure
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. If you notice any of these signs, call (737) 344-9564 for a prompt inspection.
