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 Baton Rouge, LA, 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.
For air conditioning breakdowns, see AC Repair.
Warning Signs for Furnace Repair
Catching these issues early helps you avoid costly problems. Here are the most common indicators that it's time to call a professional:
- A furnace that shuts off every few minutes before the house warms up
- Flames that start, last a few seconds, and go out again and again
- A fan that keeps running while the registers blow cool air
- The igniter glows and clicks, yet no flame ever appears
- A bang or boom when the burners ignite late
- Squealing or grinding from the blower compartment
- Water, rust stains, or black soot around the flue or cabinet
- Yellow, wavering burner flames where they should be sharp blue
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. If you notice any of these signs, call (225) 497-5436 for a prompt inspection.
