Every time your thermostat calls for heat, the furnace works through a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower begin sending warm air into the house. Finding the step that fails is most of the job. Around Los Angeles, CA, the usual failure points are a flame sensor fouled with oxide, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Each one halts the startup, and from the hallway they all look alike.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Los Angeles
Spotting the early warning signs lets you act before the problem gets expensive. Keep an eye out for the following clues:
- Grinding or high-pitched squeals from the blower
- Frequent on-off cycling that never reaches the thermostat setting
- The igniter glows and clicks, yet no flame ever appears
- Loud booms at startup caused by delayed ignition
- Air moving through the vents that never gets warm
- A pilot or burner flame that is lazy yellow instead of crisp blue
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Flames that start, last a few seconds, and go out again and again
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. If you notice any of these signs, call (213) 460-0379 for a prompt inspection.
