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 Collierville, TN, 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
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:
- Loud booms at startup caused by delayed ignition
- A flame that burns soft and yellow rather than steady blue
- Frequent on-off cycling that never reaches the thermostat setting
- Water, rust stains, or black soot around the flue or cabinet
- Squealing or grinding from the blower compartment
- A fan that keeps running while the registers blow cool air
- The igniter glows and clicks, yet no flame ever appears
- Burners light, run a few seconds, then shut down repeatedly
Early Action Saves Money
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. At the first hint of a problem, call (901) 749-8008 for a fast inspection.
