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 New York City, NY, 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.
When the AC quits in summer, 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:
- Air moving through the vents that never gets warm
- A pilot or burner flame that is lazy yellow instead of crisp blue
- A bang or boom when the burners ignite late
- Flames that start, last a few seconds, and go out again and again
- Rust streaks, soot, or water around the cabinet or flue
- Squealing or grinding from the blower compartment
- Short cycling every few minutes without reaching the setpoint
- The igniter glows and clicks, yet no flame ever appears
Early Action Saves Money
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, call (929) 596-7759 and we'll take a look right away.
