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 Worcester, MA, 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.
When the AC quits in summer, see AC Repair.
When to Call for Furnace Repair in Worcester
Recognizing the warning signs early can save you time and money. These are the signals our technicians see most often:
- Flames that start, last a few seconds, and go out again and again
- Rust streaks, soot, or water around the cabinet or flue
- Frequent on-off cycling that never reaches the thermostat setting
- A bang or boom when the burners ignite late
- The igniter glows and clicks, yet no flame ever appears
- Yellow, wavering burner flames where they should be sharp blue
- A fan that keeps running while the registers blow cool air
- Squealing or grinding from the blower compartment
Don't Wait for a Total Failure
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. At the first hint of a problem, call (774) 533-7591 for a fast inspection.
