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

December 06, 2019

While your Lennox® HVAC equipment isn’t able to chat with you, it has a process to tell you about a furnace error.

Its motherboard has two LED lights that can display a fault code. Depending on the failure, your furnace could use continuous or flashing lights.

Though there are certain basic heating repairs you can complete on your own, the majority of fixes are best handled by experts. When your furnace will not turn on or deliver heated air, call Brooks Heating and Air Conditioning at 800-COOLING for professional furnace repair in Bossier City.

Our specialists will quickly spot and take care of the breakdown, even if you don’t use a Lennox heater. We can repair whichever types or models—and get the comfort restored to your home without delay.


What Does the Flickering Light on My Heater Mean?

Your heating system relies on lights to flash code when it requires repairs. It also engages this system to relay it’s working like it should.

Correct operation includes:

  • Both lights flash slowly—furnace working properly.
  • Concurrent fast flash—furnace is beginning to call for heat.

If you see a lone light going on and off slowly and the other flashing quickly, your furnace may be experiencing a low flame signal. This can occur even when your furnace is running like it should. It signifies the flame sensing rod could have build-up or in the wrong spot on the burner. Call us at 800-COOLING for assistance.

Here are some of the most common faults for Lennox heaters.

Heating System Will Not Kick On

Here are some of the light patterns you could notice when your heat will not or stay on. Most of these problems have to be taken care of by a professional, for instance from Brooks Heating and Air Conditioning.

  1. All LED lights are off. This indicates your HVAC system might not have power. Go to the breaker box to make sure the heater fuse is not triggered. You should reset the fuse if it’s in the “off” area. If it immediately flips after a subsequent reset, leave the breaker alone and call us at 800-COOLING.
  2. A single light is stable and the other is flickering slowly. This shows the flame rollout switch is likely not working right. The component is an essential safety guard that aids in preventing fires and carbon monoxide. You shouldn’t try to fix this fault without professional help.
  3. A single light is flickering quickly and the other is blinking slowly. This typically indicates power polarity has been inverted. Your furnace could have a wiring fault that calls for expert help from Brooks Heating and Air Conditioning.
  4. The pair of lights are flickering slowly. This means your heating system’s blower motor likely isn’t working. This piece circulates warm air from the HVAC system into your residence. We can help in determining what’s causing an issue with this piece.
  5. A single light is blinking slowly and the other is blinking fast. This signifies your HVAC system may have insufficient voltage or a short circuit. Get in touch with our professionals at 800-COOLING for assistance.
  6. One light is blinking on, on and off while the other flashes on, off, on. This signifies there might be an issue with your heating system’s control panel or wiring. Brooks Heating and Air Conditioning can pinpoint the error and fix it.
  7. The pair of lights are using alternate slow flashes. This signifies your HVAC system likely has a flame error. There might be trouble with its gas supply, gas valve or ignitor control. Reach out to us at 800-COOLING for help.
  8. A single light flashes slowly while the other stays steady. This often means your furnace’s limit switch is open. The switch prevents your heater from getting too hot. Reach out to the experts at Brooks Heating and Air Conditioning for assistance.

Heater Blower Operates But No Warm Air

Here’s what could be at fault when you observe your heating system’s blower fan working, but you aren’t getting any heat.

  • The duo of lights are giving alternate rapid flickers. This indicates your furnace ignitor may not be working. This piece ignites fuel in your heater to make warm air and should be serviced by a technician from Brooks Heating and Air Conditioning.

Turn to Us for Expert Furnace Repair

When you need to have your heating system fixed quickly, trust the experts at Brooks Heating and Air Conditioning. Our technicians will fix the problem quickly and have your residence feeling cozy again in a short time. Call us at 800-COOLING or contact us online to request an appointment right away.