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 Suffolk, VA, the usual failure points are an oxide-coated flame sensor, 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. Watch for these telltale signs:
- Short cycling every few minutes without reaching the setpoint
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A fan that keeps running while the registers blow cool air
- Booming or banging at light-off from delayed ignition
- Burners light, run a few seconds, then shut down repeatedly
- Grinding or high-pitched squeals from the blower
- A flame that burns soft and yellow rather than steady blue
- The furnace clicks and glows but the burners never light
Act Before It Gets Worse
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 (757) 514-5648 for a fast inspection.
