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

December 06, 2019

While your Lennox® HVAC equipment can’t speak to you, it possesses a procedure to get your attention when there’s a furnace error.

Its motherboard has two LED lights that can show a fault code. Subject to the failure, your heating system might display steady or flashing lights.

Though there are various elementary furnace fixes you can do without an expert, the majority of repairs are best taken care of by the professionals. When your furnace refuses to kick on or provide warmth, get in touch with All Weather Heating & Air Conditioning Inc at 256-801-4701 for experienced furnace repair in Huntsville.

Our experts will rapidly identify and take care of the fault, even if you don’t own a Lennox heating system. We can repair whichever brands or models—and get the heat restored to your residence quickly.


What Does the Flashing Light on My Heater Mean?

Your heating system relies on lights to flash code when it isn’t working right. It also engages this system to tell you it’s operating correctly.

Correct operation includes:

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

If you see a single light going on and off slowly and the other flashing quickly, your heater might have a low flame signal. This can happen even when your heater is working like it should. It indicates the flame sensing rod could have build-up or in the bad location on the burner. Call us at 256-801-4701 for help.

Here are several other of the most common issues for Lennox heaters.

Furnace Won’t Kick On

Here are a few of the light arrangements you could notice when your furnace refuses to or keep running. Most of these problems need to be taken care of by a technician, such as one from All Weather Heating & Air Conditioning Inc.

  1. The pair of LED lights are extinguished. This means your heater might not have power. Check the breaker box to make sure the heater fuse has not tripped. Attempt to reset the fuse if it’s in the “off” spot. If it promptly trips after you reset it, leave the breaker alone and call us at 256-801-4701.
  2. An individual light is unchanging and the other is flashing slowly. This means the flame rollout switch is probably open. The switch is an important safety tool that aids in preventing fires and carbon monoxide. You shouldn’t try to fix this malfunction on your own.
  3. An individual light is flashing fast and the other is blinking slowly. This often indicates power polarity has been reversed. Your heating system may have a wiring error that requires professional assistance from All Weather Heating & Air Conditioning Inc.
  4. Both lights are blinking slowly. This signifies your heating system’s blower motor likely isn’t operating. This part circulates heated air from the furnace into your rooms. We can aid in pinpointing what’s causing an issue with this part.
  5. A single light is blinking slowly and the other is blinking quickly. This indicates your heater might have insufficient voltage or a short circuit. Reach out to our technicians at 256-801-4701 for support.
  6. One light is flashing on, on and off while the other flickers on, off, on. This means there may be trouble with your heating system’s control panel or wiring. All Weather Heating & Air Conditioning Inc can determine the problem and repair it.
  7. Both lights are using alternate slow flickers. This signifies your HVAC system likely has a flame problem. There might be a problem with its gas supply, gas valve or ignitor control. Contact us at 256-801-4701 for support.
  8. A single light flashes slowly while the other stays steady. This often signifies your heating system’s limit switch is not working. The switch stops your HVAC system from overheating. Call the pros at All Weather Heating & Air Conditioning Inc for support.

Heating System Blower Runs But No Warmth

Here’s what may be at fault when you notice your heater’s blower fan running, but you aren’t getting any warmth.

  • Both lights display every other quick blinks. This means your furnace ignitor might be broken. This part ignites fuel in your heater to create heat and should be serviced by a specialist from All Weather Heating & Air Conditioning Inc.

Depend on Us for Skilled Furnace Repair

When you need to get your HVAC equipment fixed fast, trust the professionals at All Weather Heating & Air Conditioning Inc. Our technicians will take care of the issue quickly and have your rooms feeling relaxing again soon. Reach out to us at 256-801-4701 or contact us online to request an appointment now.