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 start pushing warm air into the house. Finding the step that fails is most of the job. Around Stamford, CT, 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
The sooner you notice these red flags, the easier and cheaper the fix. Watch for these telltale signs:
- Booming or banging at light-off from delayed ignition
- A flame that burns soft and yellow rather than steady blue
- Flames that start, last a few seconds, and go out again and again
- Clicking and a glowing igniter with no burner flame
- Rust streaks, soot, or water around the cabinet or flue
- Short cycling every few minutes without reaching the setpoint
- The blower runs constantly but the air never warms
- Squeals, scrapes, or grinding noises behind the blower door
Early Action Saves Money
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Don't wait, call (475) 386-2330 and we'll take a look right away.
