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 begin sending warm air into the house. Finding the step that fails is most of the job. Around Citrus Heights, CA, the usual failure points are a flame sensor fouled with oxide, 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. Any one of them halts the startup, and from the hallway they all look alike.
Cooling trouble instead? See AC Repair.
Warning Signs for Furnace Repair
Catching these issues early helps you avoid costly problems. Watch for these telltale signs:
- Booming or banging at light-off from delayed ignition
- Repeated shutdowns just seconds after the burners light
- The blower runs constantly but the air never warms
- Squeals, scrapes, or grinding noises behind the blower door
- Frequent on-off cycling that never reaches the thermostat setting
- Water, rust stains, or black soot around the flue or cabinet
- The igniter glows and clicks, yet no flame ever appears
- Yellow, wavering burner flames where they should be sharp blue
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. Don't wait, call (279) 236-7585 and we'll take a look right away.
