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 Beaverton, OR, 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 Beaverton
Catching these issues early helps you avoid costly problems. Watch for these telltale signs:
- The igniter glows and clicks, yet no flame ever appears
- A furnace that shuts off every few minutes before the house warms up
- Grinding or high-pitched squeals from the blower
- Loud booms at startup caused by delayed ignition
- Yellow, wavering burner flames where they should be sharp blue
- A fan that keeps running while the registers blow cool air
- Flames that start, last a few seconds, and go out again and again
- Rust streaks, soot, or water around the cabinet or flue
Don't Wait for a Total Failure
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, call (971) 535-9449 and we'll take a look right away.
