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 start pushing warm air into the house. Finding the step that fails is most of the job. Around Clovis, 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.
Cooling trouble instead? See AC Repair.
When to Call for Furnace Repair in Clovis
Catching these issues early helps you avoid costly problems. Here are the most common indicators that it's time to call a professional:
- Grinding or high-pitched squeals from the blower
- Frequent on-off cycling that never reaches the thermostat setting
- Booming or banging at light-off from delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Water, rust stains, or black soot around the flue or cabinet
- Flames that start, last a few seconds, and go out again and again
- The blower runs constantly but the air never warms
- Yellow, wavering burner flames where they should be sharp blue
Don't Wait for a Total Failure
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 (559) 337-5477 at the first sign of trouble.
