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 Draper, UT, 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 Draper
The sooner you notice these red flags, the easier and cheaper the fix. These are the signals our technicians see most often:
- Frequent on-off cycling that never reaches the thermostat setting
- Grinding or high-pitched squeals from the blower
- Booming or banging at light-off from delayed ignition
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Clicking and a glowing igniter with no burner flame
- Air moving through the vents that never gets warm
- Repeated shutdowns just seconds after the burners light
Don't Wait for a Total Failure
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 (385) 206-5938 for a prompt inspection.
