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 sending heat through the house. Most of the diagnosis comes down to finding the broken link. In Lowell 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.
For air conditioning breakdowns, see AC Repair.
When to Call for Furnace Repair in Lowell
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- The furnace clicks and glows but the burners never light
- A fan that keeps running while the registers blow cool air
- Squeals, scrapes, or grinding noises behind the blower door
- Repeated shutdowns just seconds after the burners light
- Frequent on-off cycling that never reaches the thermostat setting
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Loud booms at startup caused by delayed ignition
Act Before It Gets Worse
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, call (351) 345-9277 and we'll take a look right away.
