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

December 06, 2019

While your Lennox® heating system can’t chat with you, it has a process to tell you about a furnace error.

Its control board has a set of LED lights that can display a fault code. Depending on the fault, your heater could use continuous or flashing lights.

Though there are various basic heating adjustments you can do yourself, the majority of fixes are best handled by experts. When your heating system won’t start or give warm air, contact Western Mechanical, Inc. at 435-753-5515 for skilled furnace repair in Logan.

Our technicians will speedily identify and fix the fault, even if you don’t have a Lennox heater. We can repair all brands or configuration—and get the comfort returned to your home without delay.


What Does the Flickering Light on My Furnace Mean?

Your furnace relies on lights to flash code when it is malfunctioning. It also works this system to tell you it’s working correctly.

Regular operation consists of:

  • Both lights flash slowly—heating system operating correctly.
  • Concurrent fast flash—heater is starting to call for heat.

If you notice a single light flashing slowly and the other going on and off rapidly, your heating system may be having a low flame signal. This can occur even when your heater is heating like it should. It means the flame sensing rod may have build-up or in the wrong location on the burner. Reach out to us at 435-753-5515 for help.

Here are a few other of the most routine problems for Lennox HVAC systems.

Heating System Won’t Kick On

Here are many of the light sequences you might notice when your furnace won’t turn on or keep running. The majority of these issues have to be repaired by a professional, for instance from Western Mechanical, Inc..

  1. All LED lights are extinguished. This signifies your heater might not be receiving power. Go to the breaker box to make sure the heating system fuse hasn’t tripped. Attempt to reset the fuse if it is in the “off” position. If it promptly turns off following a reset, leave the breaker alone and call us at 435-753-5515.
  2. An individual light is solid and the other is flashing slowly. This means the flame rollout switch is likely open. The switch is an important safety device that aids in avoiding fires and carbon monoxide. You shouldn’t seek to handle this fault on your own.
  3. A single light is flashing quickly and the other is flashing slowly. This typically means power polarity has been reversed. Your heater may have a wiring error that needs expert help from Western Mechanical, Inc..
  4. The duo of lights are flickering slowly. This means your heating system’s blower motor possibly isn’t running. This part distributes warm air from the heating system into your house. We can assist in figuring out what’s causing an issue with this piece.
  5. One light is flickering slowly and the other is blinking quickly. This indicates your HVAC system might have not enough voltage or a short circuit. Reach out to our experts at 435-753-5515 for support.
  6. One light is blinking on, on and off while the other flashes on, off, on. This indicates there may be a fault with your HVAC system’s control panel or wiring. Western Mechanical, Inc. can determine the fault and fix it.
  7. Both lights show alternate slow flickers. This means your heating system possibly has a flame failure. There might be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 435-753-5515 for assistance.
  8. One light flickers slowly while the other stays continuous. This typically indicates your HVAC system’s limit switch is malfunctioning. The switch stops your HVAC equipment from getting too hot. Reach out to the professionals at Western Mechanical, Inc. for help.

Heater Blower Works But No Warm Air

Here’s what might be broken when you hear your heating system’s blower fan running, but you aren’t gaining any warmth.

  • The pair of lights are showing every other rapid flickers. This means your furnace ignitor may not be working. This component ignites energy in your heating system to create heat and should be serviced by a specialist from Western Mechanical, Inc..

Trust Us for Expert Furnace Repair

When you have to have your heater fixed without delay, turn to the experts at Western Mechanical, Inc.. Our techs will take care of the problem without delay and have your space feeling cozy again in a short time. Contact us at 435-753-5515 or contact us online to request an appointment now.