Every time your thermostat calls for heat, the furnace runs 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 Yucaipa, CA, the usual failure points are an oxide-coated flame sensor, 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. Any one of them halts the startup, and from the hallway they all look alike.
When the AC quits in summer, see AC Repair.
Warning Signs for Furnace Repair
Catching these issues early helps you avoid costly problems. These are the signals our technicians see most often:
- A furnace that shuts off every few minutes before the house warms up
- Grinding or high-pitched squeals from the blower
- Burners light, run a few seconds, then shut down repeatedly
- Rust streaks, soot, or water around the cabinet or flue
- Booming or banging at light-off from delayed ignition
- A pilot or burner flame that is lazy yellow instead of crisp blue
- The blower runs constantly but the air never warms
- The igniter glows and clicks, yet no flame ever appears
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. At the first hint of a problem, call (909) 310-4701 for a fast inspection.
