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 begin sending warm air into the house. Finding the step that fails is most of the job. Around Conway, AR, 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.
For air conditioning breakdowns, see AC Repair.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time and money. Here are the most common indicators that it's time to call a professional:
- Squeals, scrapes, or grinding noises behind the blower door
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Air moving through the vents that never gets warm
- Short cycling every few minutes without reaching the setpoint
- Clicking and a glowing igniter with no burner flame
- Repeated shutdowns just seconds after the burners light
- Loud booms at startup caused by delayed ignition
- A pilot or burner flame that is lazy yellow instead of crisp blue
Early Action Saves Money
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, call (501) 272-1589 and we'll take a look right away.
