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 Mobile 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.
Cooling trouble instead? See AC Repair.
Warning Signs for Furnace Repair
Recognizing the warning signs early can save you time and money. Keep an eye out for the following clues:
- The blower runs constantly but the air never warms
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Booming or banging at light-off from delayed ignition
- Short cycling every few minutes without reaching the setpoint
- Repeated shutdowns just seconds after the burners light
- Squealing or grinding from the blower compartment
- The igniter glows and clicks, yet no flame ever appears
- Rust streaks, soot, or water around the cabinet or flue
Act Before It Gets Worse
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. Call (251) 485-1658 at the first sign of trouble.
