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 Renton, WA, 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.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Renton
Spotting the early warning signs lets you act before the problem gets expensive. These are the signals our technicians see most often:
- Loud booms at startup caused by delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- Flames that start, last a few seconds, and go out again and again
- Frequent on-off cycling that never reaches the thermostat setting
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- A flame that burns soft and yellow rather than steady blue
- Squealing or grinding from the blower compartment
- A fan that keeps running while the registers blow cool air
Early Action Saves Money
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. At the first hint of a problem, call (425) 969-3485 for a fast inspection.
