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 Canton, OH, 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. Each one 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
Spotting the early warning signs lets you act before the problem gets expensive. Watch for these telltale signs:
- Grinding or high-pitched squeals from the blower
- The furnace clicks and glows but the burners never light
- Flames that start, last a few seconds, and go out again and again
- Short cycling every few minutes without reaching the setpoint
- Water, rust stains, or black soot around the flue or cabinet
- A fan that keeps running while the registers blow cool air
- A bang or boom when the burners ignite late
- Yellow, wavering burner flames where they should be sharp blue
Don't Wait for a Total Failure
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 (330) 552-0542 for a prompt inspection.
