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 Lafayette, CO, 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.
Cooling trouble instead? See AC Repair.
Signs You Need Furnace Repair in Lafayette
Spotting the early warning signs lets you act before the problem gets expensive. Here are the most common indicators that it's time to call a professional:
- Squeals, scrapes, or grinding noises behind the blower door
- Repeated shutdowns just seconds after the burners light
- Clicking and a glowing igniter with no burner flame
- Frequent on-off cycling that never reaches the thermostat setting
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Booming or banging at light-off from delayed ignition
- Air moving through the vents that never gets warm
Don't Wait for a Total Failure
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. At the first hint of a problem, call (970) 602-4963 for a fast inspection.
