Furnace troubleshooting

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

While your Lennox® heater isn’t able to talk to you, it has a method to get your attention when there’s a furnace error.

Its motherboard has double LED lights that can share a fault code. Based on the fault, your heater may use steady or flashing lights.

Though there are some simple HVAC fixes you can finish without an expert, most tasks are best handled by experts. When your heater won’t start or deliver warmth, contact Franklin's Heating & Air Conditioning, Inc. at 662-281-1231 for skilled furnace repair in Oxford.

Our technicians will quickly detect and handle the failure, even if you don’t own a Lennox heater. We can repair whichever brands or makes—and get the comfort restored to your residence fast.


What Does the Flickering Light on My Furnace Mean?

Your furnace uses lights to flash code when it isn’t working right. It also engages this system to let you know it’s operating like it should.

Regular operation consists of:

  • Both lights flash slowly—furnace operating like it should.
  • Simultaneous fast flash—furnace is initiating the call for heat.

If you see a lone light flashing slowly and the other going on and off quickly, your furnace might be having a low flame signal. This can happen even when your heater is operating like it should. It means the flame sensing rod might need to be cleaned or in the incorrect area on the burner. Reach out to us at 662-281-1231 for help.

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

Heater Will Not Turn On

Here are a few of the light patterns you may notice when your heat will not or keep running. The majority of these errors must be taken care of by a specialist, like one from Franklin's Heating & Air Conditioning, Inc..

  1. All LED lights are off. This signifies your heater might not have electricity. Examine the breaker box to make sure the heating system fuse hasn’t flipped. Try resetting the fuse if it is in the “off” area. If it immediately trips after you reset it, leave the breaker alone and get in touch with us us at 662-281-1231.
  2. One light is stable and the other is flashing slowly. This signifies the flame rollout switch is may be not working right. The component is an important safety guard that assists in stopping fires and carbon monoxide. You shouldn’t seek to fix this problem yourself.
  3. A single light is flickering quickly and the other is flickering slowly. This often indicates power polarity has been transposed. Your heating system might have a wiring fault that needs expert aid from Franklin's Heating & Air Conditioning, Inc..
  4. The pair of lights are flickering slowly. This indicates your heating system’s blower motor probably isn’t operating. This part sends warm air from the furnace into your rooms. We can aid in figuring out what’s causing an issue with this piece.
  5. One light is flickering slowly and the other is flickering quickly. This means your heater may have not enough voltage or a short circuit. Contact our specialists at 662-281-1231 for assistance.
  6. One light is flashing on, on and off while the other blinks on, off, on. This means there may be a malfunction with your furnace’s control panel or wiring. Franklin's Heating & Air Conditioning, Inc. can locate the fault and fix it.
  7. The duo of lights display every other slow blinks. This signifies your heater possibly has a flame problem. There could be a problem with its gas supply, gas valve or ignitor control. Contact us at 662-281-1231 for support.
  8. An individual light blinks slowly while the other is continuous. This often indicates your furnace’s limit switch is experiencing an error. The switch prevents your furnace from overheating. Call the pros at Franklin's Heating & Air Conditioning, Inc. for assistance.

Heater Blower Works But No Warm Air

Here’s what might be wrong when you observe your furnace’s blower fan on, but you aren’t gaining any warmth.

  • Both lights display alternating rapid blinks. This signifies your furnace ignitor may be broken. This part lights gas in your heater to make heat and should be fixed by a specialist from Franklin's Heating & Air Conditioning, Inc..

Depend on Us for Expert Furnace Repair

When you need to get your heater in working order without delay, turn to the technicians at Franklin's Heating & Air Conditioning, Inc.. Our technicians will handle the issue quickly and have your rooms feeling relaxing again in no time. Contact us at 662-281-1231 or contact us online to schedule an appointment today.

Back To Blog