Top Lennox® Furnace Error Codes (and What They Mean)

December 06, 2019

While your Lennox® furnace can’t chat with you, it possesses a method to get your attention when there’s a furnace error.

Its motherboard has twin LED lights that can show a fault code. Based on the fault, your heater might display continuous or flashing lights.

Although there are certain simple furnace adjustments you can take care of on your own, most repairs are best left to the professionals. When your heater won’t kick on or deliver heated air, get in touch with 1st Choice Heating & Air Conditioning, Inc. at 949-204-0859 for expert furnace repair in Lake Forest.

Our experts will speedily diagnose and handle the failure, even if you don’t have a Lennox heating system. We can fix any brands or models—and get the heat returned to your house without delay.


What Does the Flickering Light on My Furnace Mean?

Your furnace uses lights to flash code when it requires repairs. It also uses these lights to relay it’s heating correctly.

Regular function involves:

  • Concurrent slow flash—furnace heating properly.
  • Simultaneous fast flash—heater is beginning to call for heat.

If you realize that a solitary light going on and off slowly and the other going on and off quickly, your heater could be experiencing a low flame signal. This can happen even when your heater is heating like it should. It indicates the flame sensing rod might be dirty or in the bad area on the burner. Reach out to us at 949-204-0859 for help.

Here are a few other of the most common issues for Lennox furnaces.

Heater Refuses to Turn On

Here are some of the light sequences you could see when your furnace refuses to or stay on. The bulk of these errors need to be fixed by a professional, for instance from 1st Choice Heating & Air Conditioning, Inc..

  1. Both LED lights are extinguished. This signifies your heater might not have power. Examine the breaker box to ensure the heating system fuse is not tripped. Try resetting the fuse if it has moved into the “off” position. If it immediately flips after a subsequent reset, leave the breaker alone and get in touch with us us at 949-204-0859.
  2. An individual light is stable and the other is flashing slowly. This means the flame rollout switch is probably malfunctioning. The switch is a critical safety tool that assists in avoiding fires and carbon monoxide. You shouldn’t seek to handle this issue without professional help.
  3. A single light is blinking fast and the other is flashing slowly. This often indicates power polarity has been transposed. Your heater may have a wiring error that needs expert support from 1st Choice Heating & Air Conditioning, Inc..
  4. The pair of lights are flickering slowly. This means your furnace’s blower motor probably isn’t operating. This piece circulates warm air from the heater into your home. We can help in pinpointing what’s causing a problem with this component.
  5. An individual light is flickering slowly and the other is blinking quickly. This signifies your HVAC system may have low voltage or a short circuit. Reach out to our technicians at 949-204-0859 for support.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there may be an error with your heater’s control board or wiring. 1st Choice Heating & Air Conditioning, Inc. can pinpoint the error and fix it.
  7. Both lights are using alternate slow blinks. This indicates your HVAC equipment possibly has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Call us at 949-204-0859 for support.
  8. A single light flickers slowly while the other remains steady. This often signifies your heater’s limit switch is open. The switch stops your HVAC equipment from getting too hot. Contact the professionals at 1st Choice Heating & Air Conditioning, Inc. for help.

Furnace Blower Runs But No Warm Air

Here’s what may be at fault when you hear your furnace’s blower fan on, but you aren’t receiving any warmth.

  • The duo of lights are showing alternating fast flashes. This means your furnace ignitor could not be working. This component kindles fuel in your HVAC equipment to make heat and should be serviced by a technician from 1st Choice Heating & Air Conditioning, Inc..

Trust Us for Skilled Furnace Repair

When you have to have your furnace fixed quickly, turn to the professionals at 1st Choice Heating & Air Conditioning, Inc.. Our pros will take care of the issue quickly and have your space feeling comfortable again in no time. Call us at 949-204-0859 or contact us online to request an appointment today.