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. Most of the diagnosis comes down to finding the broken link. In Peabody 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.
Warning Signs for Furnace Repair
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- Booming or banging at light-off from delayed ignition
- Air moving through the vents that never gets warm
- Burners light, run a few seconds, then shut down repeatedly
- Clicking and a glowing igniter with no burner flame
- Short cycling every few minutes without reaching the setpoint
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Rust streaks, soot, or water around the cabinet or flue
- Grinding or high-pitched squeals from the blower
Act Before It Gets Worse
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Don't wait, call (351) 345-9326 and we'll take a look right away.
