Every time your thermostat calls for heat, the furnace works through a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower start pushing warm air into the house. Finding the step that fails is most of the job. Around Spokane Valley, WA, the usual failure points are an oxide-coated flame sensor, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Each one halts the startup, and from the hallway they all look alike.
For air conditioning breakdowns, see AC Repair.
Warning Signs for Furnace Repair
Spotting the early warning signs lets you act before the problem gets expensive. Watch for these telltale signs:
- A bang or boom when the burners ignite late
- Frequent on-off cycling that never reaches the thermostat setting
- A fan that keeps running while the registers blow cool air
- Clicking and a glowing igniter with no burner flame
- Squealing or grinding from the blower compartment
- A flame that burns soft and yellow rather than steady blue
- Repeated shutdowns just seconds after the burners light
- Rust streaks, soot, or water around the cabinet or flue
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Don't wait, call (208) 208-1912 and we'll take a look right away.
