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 Fort Collins, CO, 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. Any one of them halts the startup, and from the hallway they all look alike.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Fort Collins
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- Short cycling every few minutes without reaching the setpoint
- Squeals, scrapes, or grinding noises behind the blower door
- A flame that burns soft and yellow rather than steady blue
- Air moving through the vents that never gets warm
- Burners light, run a few seconds, then shut down repeatedly
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Loud booms at startup caused by delayed ignition
- Clicking and a glowing igniter with no burner flame
Don't Wait for a Total Failure
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. If you notice any of these signs, call (970) 602-4906 for a prompt inspection.
