Furnace troubleshooting

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

While your Lennox® HVAC equipment isn’t able to speak to you, it has a way to get your attention when there’s a furnace error.

Its motherboard has double LED lights that can show a fault code. Depending on the issue, your furnace could show continuous or flashing lights.

Though there are various basic heating fixes you can finish yourself, many services are best left to experts. When your furnace won’t turn on or provide heated air, call Moon's Air at 318-215-7938 for professional furnace repair in Shreveport.

Our experts will rapidly determine and fix the fault, even if you don’t own a Lennox heater. We can fix whichever types or models—and get the warmth reintroduced to your home fast.


What Does the Blinking Light on My Heater Mean?

Your furnace relies on lights to flash code when it requires repairs. It also uses these lights to let you know it’s heating correctly.

Regular heating involves:

  • Simultaneous slow flash—furnace running correctly.
  • Concurrent fast flash—heating system is starting to call for heat.

If you realize that a lone light blinking slowly and the other flashing fast, your furnace might have a low flame signal. This can occur even when your heating system is running like it should. It means the flame sensing rod could have build-up or in the bad location on the burner. Reach out to us at 318-215-7938 for support.

Here are a few other of the most typical faults for Lennox heaters.

Heating System Refuses to Kick On

Here are many of the light sequences you could see when your heater refuses to or keep heating. The bulk of these errors need to be repaired by a technician, like one from Moon's Air.

  1. Both LED lights are off. This means your heating system might not have electricity. Look at the breaker box to make sure the heating system fuse isn’t triggered. Attempt to reset the fuse if it’s in the “off” area. If it rapidly turns off after a subsequent reset, leave the breaker alone and contact us at 318-215-7938.
  2. One light is unchanging and the other is blinking slowly. This means the flame rollout switch is probably open. The switch is an essential safety guard that aids in avoiding fires and carbon monoxide. You shouldn’t seek to repair this malfunction on your own.
  3. An individual light is blinking quickly and the other is flickering slowly. This likely means power polarity has been reversed. Your heating system could have a wiring problem that calls for expert support from Moon's Air.
  4. The duo of lights are flashing slowly. This means your heating system’s blower motor likely isn’t operating. This component moves hot air from the heater into your rooms. We can help in pinpointing what’s causing a problem with this piece.
  5. An individual light is flickering slowly and the other is flashing quickly. This means your HVAC system could have not enough voltage or a short circuit. Get in touch with our specialists at 318-215-7938 for help.
  6. One light is blinking on, on and off while the other blinks on, off, on. This indicates there may be an issue with your HVAC system’s motherboard or wiring. Moon's Air can locate the problem and repair it.
  7. The duo of lights are using alternate slow flashes. This means your HVAC equipment likely has a flame failure. There might be an issue with its gas supply, gas valve or ignitor control. Get in touch with us at 318-215-7938 for assistance.
  8. One light flickers slowly while the other stays continuous. This typically indicates your HVAC system’s limit switch is malfunctioning. The switch keeps your heating system from becoming too warm. Contact the professionals at Moon's Air for help.

Furnace Blower Operates But No Warm Air

Here’s what might be wrong when you notice your heating system’s blower fan working, but you aren’t receiving any heated air.

  • The duo of lights are giving alternating quick flickers. This means your furnace ignitor might not be working. This piece ignites gas in your heater to make heat and should be repaired by a specialist from Moon's Air.

Turn to Us for Professional Furnace Repair

When you need to get your heating system in working order without delay, depend on the professionals at Moon's Air. Our pros will take care of the problem right away and have your home feeling cozy again in a short time. Call us at 318-215-7938 or contact us online to get an appointment today.

Back To Blog