From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, the sequence is strict: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower sending heat through the house. Diagnosis is mostly a matter of finding where that chain breaks. In Pittsburgh homes, it tends to be the same handful of culprits: a flame sensor coated in oxide, a hot surface igniter cracked by thermal cycling, a pressure switch held open by a tired inducer or a plugged condensate trap, or a control board with a burned relay.
Cooling trouble instead? See AC Repair.
Signs You Need Furnace Repair in Pittsburgh
Spotting the early warning signs lets you act before the problem gets expensive. Keep an eye out for the following clues:
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Air moving through the vents that never gets warm
- Booming or banging at light-off from delayed ignition
- A flame that burns soft and yellow rather than steady blue
- Burners light, run a few seconds, then shut down repeatedly
- Grinding or high-pitched squeals from the blower
- Clicking and a glowing igniter with no burner flame
- Short cycling every few minutes without reaching the setpoint
Early Action Saves Money
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Don't wait, call (412) 205-0164 and we'll take a look right away.
