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 Tigard, 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.
When to Call for Furnace Repair in Tigard
The sooner you notice these red flags, the easier and cheaper the fix. Here are the most common indicators that it's time to call a professional:
- Repeated shutdowns just seconds after the burners light
- The furnace clicks and glows but the burners never light
- A flame that burns soft and yellow rather than steady blue
- Short cycling every few minutes without reaching the setpoint
- A fan that keeps running while the registers blow cool air
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Loud booms at startup caused by delayed ignition
- Squealing or grinding from the blower compartment
Act Before It Gets Worse
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Call (971) 535-9452 at the first sign of trouble.
