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 Rochester Hills, MI, 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.
Signs You Need Furnace Repair in Rochester Hills
Catching these issues early helps you avoid costly problems. Here are the most common indicators that it's time to call a professional:
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Grinding or high-pitched squeals from the blower
- Short cycling every few minutes without reaching the setpoint
- The blower runs constantly but the air never warms
- Yellow, wavering burner flames where they should be sharp blue
- Loud booms at startup caused by delayed ignition
- Repeated shutdowns just seconds after the burners light
- The furnace clicks and glows but the burners never light
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. At the first hint of a problem, call (248) 278-1836 for a fast inspection.
