A modern furnace runs a strict startup sequence, and knowing where the sequence breaks is most of the diagnosis. The thermostat calls, the inducer motor spins up to prove draft through a pressure switch, the hot surface igniter glows, the gas valve opens, the burners light, the flame sensor confirms fire, and only then does the blower deliver heat to the house. In Port Orange, FL, the failures cluster at predictable points: a flame sensor coated in oxide that can no longer prove the flame, a hot surface igniter cracked from years of thermal cycling, a pressure switch that will not close because the inducer is weak or the condensate trap on a high-efficiency model has clogged, or a control board with a burned relay. Each one stops the sequence cold, and each one mimics the others from the hallway.
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. These are the signals our technicians see most often:
- The blower runs constantly but the air never warms
- Repeated shutdowns just seconds after the burners light
- The furnace clicks and glows but the burners never light
- Frequent on-off cycling that never reaches the thermostat setting
- Water, rust stains, or black soot around the flue or cabinet
- Booming or banging at light-off from delayed ignition
- Yellow, wavering burner flames where they should be sharp blue
- Grinding or high-pitched squeals from the blower
Early Action Saves Money
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call (386) 200-1801 at the first sign of trouble.
