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

December 06, 2019

While your Lennox® furnace can’t talk to you, it has a way to tell you about a furnace error.

Its motherboard has twin LED lights that can show a fault code. Depending on the fault, your heating system could show continuous or flashing lights.

While there are some simple heating repairs you can finish yourself, most repairs are best left to HVAC technicians. When your furnace refuses to start or give heated air, reach out to Central Aire Heating & A/C Inc at 318-855-2326 for professional furnace repair in Bossier City.

Our technicians will swiftly diagnose and fix the issue, even if you don’t have a Lennox heating system. We can fix whichever types or models—and get the comfort reintroduced to your residence quickly.


What Does the Blinking Light on My Heating System Mean?

Your heater uses lights to flash code when it needs to be repaired. It also engages this setup to relay it’s operating correctly.

Normal function consists of:

  • Simultaneous slow flash—furnace working properly.
  • Concurrent fast flash—heater is beginning to call for heat.

If you realize that a solitary light blinking slowly and the other flashing fast, your heating system may be experiencing a low flame signal. This can happen even when your heater is operating correctly. It means the flame sensing rod may need to be cleaned or in the bad spot on the burner. Call us at 318-855-2326 for help.

Here are some of the most typical problems for Lennox HVAC systems.

Heater Will Not Turn On

Here are a few of the light sequences you might notice when your heat will not or keep operating. The bulk of these problems need to be handled by a technician, like one from Central Aire Heating & A/C Inc.

  1. The pair of LED lights aren’t lit. This signifies your HVAC system might not have power. Find the breaker box to make sure the heating system fuse is not triggered. You should reset the fuse if it’s in the “off” area. If it instantly turns off after a subsequent reset, don’t touch the breaker and get in touch with us us at 318-855-2326.
  2. An individual light is stable and the other is flashing slowly. This means the flame rollout switch is possibly malfunctioning. The component is a critical safety mechanism that aids in avoiding fires and carbon monoxide. You shouldn’t try to fix this problem on your own.
  3. A single light is blinking 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 Central Aire Heating & A/C Inc.
  4. Both lights are flashing slowly. This signifies your heater’s blower motor possibly isn’t working. This part distributes heated air from the HVAC system into your residence. We can help in pinpointing what’s causing an issue with this part.
  5. A single light is blinking slowly and the other is flashing fast. This signifies your heating system might have low voltage or a short circuit. Call our specialists at 318-855-2326 for assistance.
  6. One light is flickering on, on and off while the other flickers on, off, on. This means there may be an error with your HVAC system’s motherboard or wiring. Central Aire Heating & A/C Inc can determine the problem and repair it.
  7. The pair of lights are using alternating slow flickers. This signifies your heating system likely has a flame problem. There may be an issue with its gas supply, gas valve or ignitor control. Get in touch with us at 318-855-2326 for assistance.
  8. A single light flickers slowly while the other is continuous. This usually signifies your heating system’s limit switch is not working. The switch stops your heating system from becoming too warm. Call the professionals at Central Aire Heating & A/C Inc for help.

Furnace Blower Works But No Warmth

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

  • The pair of lights display alternating fast flickers. This indicates your furnace ignitor might not be working. This piece ignites energy in your furnace to make warmth and should be fixed by a technician from Central Aire Heating & A/C Inc.

Trust Us for Expert Furnace Repair

When you have to get your heater fixed without delay, turn to the technicians at Central Aire Heating & A/C Inc. Our techs will take care of the problem right away and have your residence feeling relaxing again in no time. Get in touch with us at 318-855-2326 or contact us online to request an appointment today.