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 Mission, TX, 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.
When to Call for Furnace Repair in Mission
Catching these issues early helps you avoid costly problems. These are the signals our technicians see most often:
- A fan that keeps running while the registers blow cool air
- A furnace that shuts off every few minutes before the house warms up
- Grinding or high-pitched squeals from the blower
- Flames that start, last a few seconds, and go out again and again
- Booming or banging at light-off from delayed ignition
- The igniter glows and clicks, yet no flame ever appears
- A flame that burns soft and yellow rather than steady blue
- Water, rust stains, or black soot around the flue or cabinet
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call (956) 253-1451 at the first sign of trouble.
