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

December 06, 2019

While your Lennox® heater can’t speak to you, it does have a process to tell you about a furnace error.

Its motherboard has twin LED lights that can share a fault code. Subject to the fault, your heating system might use continuous or flashing lights.

Although there are some basic furnace repairs you can do yourself, many tasks are best handled by experts. When your furnace won’t start or put out warmth, reach out to Wolfe & Sons Heating and Cooling at 614-451-0846 for professional furnace repair in Columbus.

Our experts will speedily discover and fix the fault, even if you don’t have a Lennox heating system. We can repair any brands or models—and get the warmth returned to your home fast.


What Does the Blinking Light on My Heating System Mean?

Your heating system relies on lights to flash code when it needs to be repaired. It also works this system to let you know it’s operating correctly.

Correct heating involves:

  • Both lights flash slowly—heating system heating like it should.
  • Concurrent fast flash—heating system is beginning to call for heat.

If you realize that a lone light flashing slowly and the other going on and off quickly, your heater may be experiencing a low flame signal. This can take place even when your heating system is heating like it should. It indicates the flame sensing rod might have build-up or in the incorrect location on the burner. Contact us at 614-451-0846 for help.

Here are several other of the most common errors for Lennox furnaces.

Heating System Won’t Kick On

Here are some of the light arrangements you may observe when your heater refuses to or keep heating. The bulk of these errors have to be repaired by a specialist, like one from Wolfe & Sons Heating and Cooling.

  1. Both LED lights are extinguished. This means your heating system might not be receiving power. Find the breaker box to make sure the furnace fuse isn’t triggered. Attempt to reset the fuse if it is in the “off” area. If it immediately flips after you reset it, leave the breaker alone and contact us at 614-451-0846.
  2. An individual light is unchanging and the other is blinking slowly. This implies the flame rollout switch is possibly malfunctioning. The component is a critical safety device that assists in preventing fires and carbon monoxide. You shouldn’t seek to take care of this issue without professional help.
  3. One light is flashing fast and the other is flashing slowly. This often means power polarity has been inverted. Your heating system may have a wiring problem that needs expert help from Wolfe & Sons Heating and Cooling.
  4. All lights are flashing slowly. This signifies your furnace’s blower motor likely isn’t running. This component moves warm air from the heater into your rooms. We can aid in pinpointing what’s wrong with this piece.
  5. An individual light is blinking slowly and the other is flashing rapidly. This means your furnace might have low voltage or a short circuit. Get in touch with our professionals at 614-451-0846 for support.
  6. One light is blinking on, on and off while the other blinks on, off, on. This means there might be trouble with your heater’s control board or wiring. Wolfe & Sons Heating and Cooling can determine the error and handle it.
  7. The duo of lights show alternate slow flickers. This indicates your furnace likely has a flame problem. There could be trouble with its gas supply, gas valve or ignitor control. Call us at 614-451-0846 for assistance.
  8. A single light flickers slowly while the other remains continuous. This often indicates your HVAC equipment’s limit switch is malfunctioning. The switch keeps your furnace from becoming too warm. Contact the professionals at Wolfe & Sons Heating and Cooling for help.

Furnace Blower Runs But No Warm Air

Here’s what could be at fault when you notice your heating system’s blower fan working, but you aren’t gaining any warmth.

  • Both lights are showing alternate rapid flickers. This indicates your furnace ignitor may be broken. This component kindles energy in your heating system to produce heat and should be fixed by an expert from Wolfe & Sons Heating and Cooling.

Trust Us for Professional Furnace Repair

When you need to get your heater repaired quickly, trust the professionals at Wolfe & Sons Heating and Cooling. Our pros will handle the fault right away and have your house feeling cozy again soon. Call us at 614-451-0846 or contact us online to get an appointment now.