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 Elizabeth 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 Elizabeth
The sooner you notice these red flags, the easier and cheaper the fix. Here are the most common indicators that it's time to call a professional:
- Loud booms at startup caused by delayed ignition
- Air moving through the vents that never gets warm
- Burners light, run a few seconds, then shut down repeatedly
- Water, rust stains, or black soot around the flue or cabinet
- Frequent on-off cycling that never reaches the thermostat setting
- Yellow, wavering burner flames where they should be sharp blue
- Squealing or grinding from the blower compartment
- Clicking and a glowing igniter with no burner flame
Don't Wait for a Total Failure
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Don't wait, call (908) 201-6779 and we'll take a look right away.
