Most Frequent Lennox® Furnace Error Codes (and What They Mean)

December 06, 2019

While your Lennox® furnace cannot speak to you, it has a method to tell you about a furnace error.

Its control board has twin LED lights that can display a fault code. Based on the failure, your heating system could display continuous or flashing lights.

Although there are some basic heating fixes you can do on your own, most fixes are best handled by the professionals. When your furnace won’t start or give heat, contact The Frazier Company at 402-628-0206 for experienced furnace repair in Omaha.

Our experts will speedily spot and repair the fault, even if you don’t own a Lennox heater. We can service whichever kinds or configuration—and get the warmth returned to your home fast.


What Does the Blinking Light on My Heating System Mean?

Your heater relies on lights to flash code when it isn’t working right. It also works these lights to relay it’s working like it should.

Regular operation includes:

  • Simultaneous slow flash—heating system operating like it should.
  • Simultaneous fast flash—furnace is starting to call for heat.

If you notice one light blinking slowly and the other blinking fast, your heating system could be experiencing a low flame signal. This can happen even when your heater is running correctly. It indicates the flame sensing rod might need to be cleaned or in the bad location on the burner. Call us at 402-628-0206 for support.

Here are several other of the most routine faults for Lennox HVAC systems.

Furnace Will Not Turn On

Here are some of the light arrangements you could see when your heat will not or stay on. Most of these issues have to be fixed by a technician, such as one from The Frazier Company.

  1. The pair of LED lights are off. This signifies your heater might not have power. Check the breaker box to confirm the heater fuse hasn’t tripped. You should reset the fuse if it is in the “off” spot. If it rapidly turns off after you reset it, don’t touch the breaker and contact us at 402-628-0206.
  2. One light is stable and the other is blinking slowly. This signifies the flame rollout switch is possibly malfunctioning. The switch is an essential safety tool that aids in stopping fires and carbon monoxide. You shouldn’t try to fix this issue yourself.
  3. One light is flashing quickly and the other is blinking slowly. This usually means power polarity has been transposed. Your heating system could have a wiring issue that calls for professional help from The Frazier Company.
  4. Both lights are flickering slowly. This signifies your heating system’s blower motor likely isn’t working. This piece moves hot air from the heater into your house. We can aid in figuring out what’s causing a problem with this component.
  5. An individual light is blinking slowly and the other is flickering fast. This signifies your HVAC system might have not enough voltage or a short circuit. Reach out to our specialists at 402-628-0206 for help.
  6. One light is flashing on, on and off while the other flickers on, off, on. This means there may be a problem with your HVAC system’s control panel or wiring. The Frazier Company can locate the error and handle it.
  7. The pair of lights are using alternate slow flashes. This indicates your heater likely has a flame failure. There may be an issue with its gas supply, gas valve or ignitor control. Get in touch with us at 402-628-0206 for assistance.
  8. A single light flashes slowly while the other stays continuous. This typically means your HVAC system’s limit switch is malfunctioning. The switch stops your heater from getting too hot. Get in touch with the pros at The Frazier Company for assistance.

Heating System Blower Runs But No Heat

Here’s what could be wrong when you hear your furnace’s blower fan running, but you aren’t gaining any heated air.

  • The duo of lights display alternate quick blinks. This signifies your furnace ignitor could not be in working order. This part lights gas in your heating system to create warmth and should be fixed by a specialist from The Frazier Company.

Trust Us for Expert Furnace Repair

When you have to have your heater in working order quickly, trust the experts at The Frazier Company. Our technicians will take care of the fault quickly and have your home feeling cozy again in a short time. Contact us at 402-628-0206 or contact us online to request an appointment right away.