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 Miramar, FL, 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. 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
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:
- Booming or banging at light-off from delayed ignition
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- The furnace clicks and glows but the burners never light
- Grinding or high-pitched squeals from the blower
- A furnace that shuts off every few minutes before the house warms up
- Burners light, run a few seconds, then shut down repeatedly
- A fan that keeps running while the registers blow cool air
- A pilot or burner flame that is lazy yellow instead of crisp blue
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. At the first hint of a problem, call (754) 242-8815 for a fast inspection.
