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 moving heat through the ducts. Diagnosis is mostly a matter of finding where that chain breaks. In Summerville 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.
Signs You Need Furnace Repair in Summerville
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- Short cycling every few minutes without reaching the setpoint
- Yellow, wavering burner flames where they should be sharp blue
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Air moving through the vents that never gets warm
- Grinding or high-pitched squeals from the blower
- The furnace clicks and glows but the burners never light
- Flames that start, last a few seconds, and go out again and again
- A bang or boom when the burners ignite late
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. At the first hint of a problem, call (843) 268-6991 for a fast inspection.
