From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, everything happens in a strict order: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower moving heat through the ducts. Most of the diagnosis comes down to finding the broken link. In Cary 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.
When the AC quits in summer, see AC Repair.
When to Call for Furnace Repair in Cary
Recognizing the warning signs early can save you time and money. Watch for these telltale signs:
- Flames that start, last a few seconds, and go out again and again
- The igniter glows and clicks, yet no flame ever appears
- Grinding or high-pitched squeals from the blower
- A fan that keeps running while the registers blow cool air
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Loud booms at startup caused by delayed ignition
- Rust streaks, soot, or water around the cabinet or flue
- Short cycling every few minutes without reaching the setpoint
Early Action Saves Money
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. Don't wait, call (984) 213-5953 and we'll take a look right away.
