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 Chico, 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. Any one of them halts the startup, and from the hallway they all look alike.
When the AC quits in summer, see AC Repair.
When to Call for Furnace Repair in Chico
The sooner you notice these red flags, the easier and cheaper the fix. Watch for these telltale signs:
- Loud booms at startup caused by delayed ignition
- Water, rust stains, or black soot around the flue or cabinet
- A fan that keeps running while the registers blow cool air
- Repeated shutdowns just seconds after the burners light
- Grinding or high-pitched squeals from the blower
- Frequent on-off cycling that never reaches the thermostat setting
- A flame that burns soft and yellow rather than steady blue
- The furnace clicks and glows but the burners never light
Early Action Saves Money
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Call (530) 201-3646 at the first sign of trouble.
