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 start pushing warm air into the house. Finding the step that fails is most of the job. Around Bay City, MI, 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 Bay City
The sooner you notice these red flags, the easier and cheaper the fix. Keep an eye out for the following clues:
- Rust streaks, soot, or water around the cabinet or flue
- Repeated shutdowns just seconds after the burners light
- A flame that burns soft and yellow rather than steady blue
- Grinding or high-pitched squeals from the blower
- Short cycling every few minutes without reaching the setpoint
- A fan that keeps running while the registers blow cool air
- A bang or boom when the burners ignite late
- The igniter glows and clicks, yet no flame ever appears
Early Action Saves Money
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call (989) 203-1760 at the first sign of trouble.
