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 Vancouver 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
The sooner you notice these red flags, the easier and cheaper the fix. These are the signals our technicians see most often:
- Booming or banging at light-off from delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Frequent on-off cycling that never reaches the thermostat setting
- Burners light, run a few seconds, then shut down repeatedly
- The blower runs constantly but the air never warms
- Squeals, scrapes, or grinding noises behind the blower door
- A pilot or burner flame that is lazy yellow instead of crisp blue
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call (971) 535-9388 at the first sign of trouble.
