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

December 06, 2019

While your Lennox® HVAC equipment isn’t able to speak to you, it does have a procedure to tell you about a furnace error.

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

Though there are some basic HVAC repairs you can take care of without an expert, most tasks are best left to HVAC technicians. When your furnace refuses to kick on or provide warm air, contact Air Temperature Control at 478-202-3170 for professional furnace repair in Macon.

Our technicians will speedily pinpoint and repair the failure, even if you don’t have a Lennox furnace. We can fix all kinds or makes—and get the heat reintroduced to your residence quickly.


What Does the Blinking Light on My Heater Mean?

Your heater depends on lights to flash code when it needs to be repaired. It also uses these lights to tell you it’s operating properly.

Normal function involves:

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

If you notice one light going on and off slowly and the other flashing quickly, your furnace could have a low flame signal. This can take place even when your heater is working correctly. It indicates the flame sensing rod may need to be cleaned or in the wrong spot on the burner. Contact us at 478-202-3170 for assistance.

Here are some of the most common problems for Lennox furnaces.

Furnace Won’t Kick On

Here are many of the light sequences you might observe when your heater won’t turn on or keep operating. Most of these problems must be fixed by a professional, for instance from Air Temperature Control.

  1. The duo of LED lights are off. This means your furnace might not have power. Look at the breaker box to make sure the heater fuse is not triggered. Try resetting the fuse if it has moved into the “off” position. If it immediately trips after a subsequent reset, don’t try to reset it again and get in touch with us us at 478-202-3170.
  2. One light is unchanging and the other is flickering slowly. This shows the flame rollout switch is may be malfunctioning. The part is an essential safety guard that aids in stopping fires and carbon monoxide. You shouldn’t seek to handle this issue on your own.
  3. A single light is flashing rapidly and the other is flashing slowly. This often signifies power polarity has been reversed. Your heating system could have a wiring error that calls for specialized assistance from Air Temperature Control.
  4. All lights are flashing slowly. This means your heater’s blower motor probably isn’t operating. This part sends warm air from the heater into your rooms. We can aid in figuring out what’s causing an issue with this part.
  5. An individual light is blinking slowly and the other is flashing quickly. This means your furnace may have not enough voltage or a short circuit. Reach out to our specialists at 478-202-3170 for support.
  6. One light is flickering on, on and off while the other flickers on, off, on. This means there might be an error with your heater’s motherboard or wiring. Air Temperature Control can find the error and take care of it.
  7. Both lights show alternate slow flashes. This means your heater may have a flame error. There could be trouble with its gas supply, gas valve or ignitor control. Contact us at 478-202-3170 for assistance.
  8. An individual light flashes slowly while the other is solid. This often indicates your furnace’s limit switch is not working. The switch keeps your HVAC system from becoming too warm. Reach out to the experts at Air Temperature Control for assistance.

Heating System Blower Works But No Warm Air

Here’s what could be broken when you hear your heating system’s blower fan working, but you aren’t receiving any heated air.

  • The duo of lights display every other fast flickers. This means your furnace ignitor might not be working. This piece kindles energy in your furnace to make warm air and should be serviced by an expert from Air Temperature Control.

Turn to Us for Expert Furnace Repair

When you need to get your heater repaired quickly, turn to the professionals at Air Temperature Control. Our pros will repair the issue without delay and have your home feeling relaxing again in a short time. Call us at 478-202-3170 or contact us online to request an appointment right away.