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 Pasco, WA, 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.
For air conditioning breakdowns, see AC Repair.
When to Call for Furnace Repair in Pasco
Catching these issues early helps you avoid costly problems. Keep an eye out for the following clues:
- Air moving through the vents that never gets warm
- Grinding or high-pitched squeals from the blower
- Flames that start, last a few seconds, and go out again and again
- Water, rust stains, or black soot around the flue or cabinet
- Frequent on-off cycling that never reaches the thermostat setting
- Booming or banging at light-off from delayed ignition
- Clicking and a glowing igniter with no burner flame
- Yellow, wavering burner flames where they should be sharp blue
Early Action Saves Money
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. If you notice any of these signs, call (208) 208-1913 for a prompt inspection.
