FLAME SENSOR

Shop furnace flame sensors at Open To Public HVAC Parts in Dallas. We carry OEM and universal replacement flame sensors for gas furnaces from Goodman, Rheem, Carrier, Trane, Lennox, and other major brands. A common fix for furnace lockout issues — in stock for same-day pickup.

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We test parts at the counter and match the right replacement. Walk in or call ahead.
☎ Call (214) 340-9421 📍 Get Directions Mon–Fri 10–7  |  Sat 10–3
In-Store Pickup Only — Browse our catalog below, then visit us in Dallas or call (214) 340-9421 to purchase.

Signs You May Need a New Flame Sensor

The flame sensor is a small metal rod inside your gas furnace that confirms a flame is present after the gas valve opens. When it's dirty or failed, the furnace shuts down as a safety precaution.

🔥Furnace Lights Then Shuts Off After a Few Seconds
  • The burners ignite, run for 3–8 seconds, then the flame goes out.
  • The furnace may attempt this cycle 2–3 times before locking out.
  • This is the #1 most common flame sensor symptom.

Tip: Before replacing the flame sensor, try cleaning it with fine sandpaper or steel wool. A dirty sensor is the most common furnace repair — and it's free to fix.

🔄Furnace Short-Cycles Repeatedly
  • The furnace starts and stops repeatedly over a short period.
  • Each cycle may get shorter as the control board counts failed attempts.
  • After 3 failed attempts, most furnaces will lock out for 1–3 hours.
🔴Flashing Error Code on the Control Board
  • The LED on your furnace control board is blinking a specific pattern.
  • Common codes: "flame sensed without call for heat" or "no flame detected."
  • Check the label inside your furnace door for the code chart.
Furnace Won't Ignite at All
  • After multiple lockout cycles, the furnace may stop attempting to light.
  • You'll need to reset the furnace (turn power off/on) or wait for the lockout timer.
  • If cleaning doesn't fix it, the sensor rod itself may be cracked or worn out.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
📞 (214) 340-9421Mon–Fri 10 am – 7 pm  |  Sat 10 am – 3 pm

🎥 Watch our video tutorial: How to Clean & Replace a Flame Sensor