Every time your thermostat calls for heat, the furnace runs 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 Sandy Springs, GA, 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. Each one halts the startup, and from the hallway they all look alike.
When the AC quits in summer, see AC Repair.
Signs You Need Furnace Repair in Sandy Springs
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- Yellow, wavering burner flames where they should be sharp blue
- Grinding or high-pitched squeals from the blower
- A furnace that shuts off every few minutes before the house warms up
- Air moving through the vents that never gets warm
- A bang or boom when the burners ignite late
- Flames that start, last a few seconds, and go out again and again
- The igniter glows and clicks, yet no flame ever appears
- Water, rust stains, or black soot around the flue or cabinet
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. If you notice any of these signs, call (470) 200-3152 for a prompt inspection.
