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

December 06, 2019

While your Lennox® heater isn’t able to speak to you, it does have a method to communicate a furnace error.

Its control panel has a set of LED lights that can display a fault code. Subject to the issue, your heater might show steady or flashing lights.

Though there are certain basic HVAC fixes you can finish on your own, most services are best taken care of by experts. When your heating system won’t start or deliver warmth, get in touch with Freed Heating & Air Conditioning at 309-323-9584 for skilled furnace repair in Moline.

Our technicians will swiftly pinpoint and repair the failure, even if you don’t have a Lennox heating system. We can fix whichever brands or configuration—and get the comfort restored to your house quickly.


What Does the Blinking Light on My Heating System Mean?

Your heating system depends on lights to flash code when it needs to be repaired. It also uses this system to tell you it’s running properly.

Regular operation includes:

  • Both lights flash slowly—heater running correctly.
  • Both lights flash fast—heater is initiating the call for heat.

If you notice a solitary light blinking slowly and the other going on and off fast, your heating system could be having a low flame signal. This can occur even when your furnace is heating correctly. It signifies the flame sensing rod might have build-up or in the bad spot on the burner. Reach out to us at 309-323-9584 for help.

Here are some of the most common faults for Lennox HVAC systems.

Heater Won’t Turn On

Here are many of the light arrangements you could see when your furnace won’t turn on or keep operating. The majority of these problems have to be fixed by an expert, like one from Freed Heating & Air Conditioning.

  1. All LED lights aren’t lit. This signifies your heating system might not be receiving power. Go to the breaker box to ensure the heating system fuse has not flipped. Try resetting the fuse if it’s in the “off” position. If it promptly trips after you reset it, don’t try to reset it again and call us at 309-323-9584.
  2. One light is solid and the other is flickering slowly. This means the flame rollout switch is probably open. The component is a critical safety tool that helps in avoiding fires and carbon monoxide. You shouldn’t attempt to handle this fault on your own.
  3. A single light is flashing rapidly and the other is blinking slowly. This likely means power polarity has been transposed. Your heater could have a wiring problem that calls for professional support from Freed Heating & Air Conditioning.
  4. The pair of lights are flickering slowly. This signifies your heating system’s blower motor possibly isn’t running. This piece moves heated air from the heater into your residence. We can aid in figuring out what’s causing an issue with this part.
  5. One light is flashing slowly and the other is blinking quickly. This means your heater could have low voltage or a short circuit. Get in touch with our professionals at 309-323-9584 for assistance.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there may be a fault with your HVAC system’s control board or wiring. Freed Heating & Air Conditioning can pinpoint the fault and take care of it.
  7. The pair of lights are using every other slow blinks. This means your HVAC equipment may have a flame issue. There may be trouble with its gas supply, gas valve or ignitor control. Call us at 309-323-9584 for assistance.
  8. A single light flickers slowly while the other is solid. This usually indicates your heater’s limit switch is open. The switch prevents your furnace from getting too hot. Call the experts at Freed Heating & Air Conditioning for support.

Furnace Blower Operates But No Heat

Here’s what may be at fault when you observe your furnace’s blower fan on, but you aren’t gaining any heated air.

  • The pair of lights display every other quick flashes. This signifies your furnace ignitor may not be working. This component ignites fuel in your heater to create warm air and should be fixed by a specialist from Freed Heating & Air Conditioning.

Depend on Us for Skilled Furnace Repair

When you need to get your HVAC equipment repaired fast, depend on the experts at Freed Heating & Air Conditioning. Our technicians will take care of the error without delay and have your rooms feeling relaxing again in a short time. Contact us at 309-323-9584 or contact us online to get an appointment right away.