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 Dublin, OH, 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.
When the AC quits in summer, see AC Repair.
Signs You Need Furnace Repair in Dublin
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A fan that keeps running while the registers blow cool air
- Squealing or grinding from the blower compartment
- Loud booms at startup caused by delayed ignition
- Yellow, wavering burner flames where they should be sharp blue
- Short cycling every few minutes without reaching the setpoint
- Flames that start, last a few seconds, and go out again and again
- 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 (380) 255-6023 at the first sign of trouble.
