Furnace troubleshooting

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

While your Lennox® heating system can’t talk to you, it does have a way to tell you about a furnace error.

Its motherboard has twin LED lights that can display a fault code. Subject to the fault, your furnace may use solid or flashing lights.

Although there are various elementary heating adjustments you can finish on your own, the majority of repairs are best left to HVAC technicians. When your heating system won’t kick on or provide warmth, contact Assured Appliance and Heating & Air at 847-306-8990 for skilled furnace repair in Genoa.

Our technicians will rapidly detect and repair the fault, even if you don’t own a Lennox heater. We can fix whichever types or configuration—and get the warmth restored to your residence fast.


What Does the Flashing Light on My Heating System Mean?

Your heater depends on lights to flash code when it requires repairs. It also works this system to tell you it’s heating like it should.

Correct function includes:

  • Both lights flash slowly—furnace running properly.
  • Concurrent fast flash—heater is beginning to call for heat.

If you realize that a single light blinking slowly and the other flashing rapidly, your furnace may be experiencing a low flame signal. This can occur even when your furnace is operating like it should. It indicates the flame sensing rod might be dirty or in the wrong spot on the burner. Call us at 847-306-8990 for support.

Here are a few other of the most typical errors for Lennox heating systems.

Heater Won’t Turn On

Here are some of the light arrangements you could observe when your heater won’t turn on or keep running. The bulk of these errors must be taken care of by a specialist, like one from Assured Appliance and Heating & Air.

  1. The pair of LED lights aren’t lit. This indicates your HVAC system might not have power. Look at the breaker box to make sure the heating system fuse isn’t flipped. Try resetting the fuse if it has moved into the “off” position. If it immediately flips after you reset it, don’t touch the breaker and call us at 847-306-8990.
  2. An individual light is continuous and the other is flickering slowly. This signifies the flame rollout switch is possibly open. The switch is an essential safety tool that assists in stopping fires and carbon monoxide. You shouldn’t try to handle this problem without professional help.
  3. An individual light is blinking rapidly and the other is flickering slowly. This likely means power polarity has been transposed. Your furnace could have a wiring fault that needs professional help from Assured Appliance and Heating & Air.
  4. Both lights are blinking slowly. This means your heater’s blower motor possibly isn’t operating. This component circulates heated air from the heating system into your residence. We can aid in determining what’s causing a problem with this piece.
  5. An individual light is flashing slowly and the other is flashing quickly. This indicates your heater could have low voltage or a short circuit. Contact our specialists at 847-306-8990 for help.
  6. One light is flashing on, on and off while the other flickers on, off, on. This indicates there might be trouble with your furnace’s control panel or wiring. Assured Appliance and Heating & Air can determine the problem and repair it.
  7. The duo of lights are using alternate slow blinks. This indicates your HVAC equipment possibly has a flame problem. There may be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 847-306-8990 for support.
  8. A single light blinks slowly while the other remains continuous. This often signifies your HVAC system’s limit switch is malfunctioning. The switch stops your heating system from getting too hot. Reach out to the experts at Assured Appliance and Heating & Air for help.

Heating System Blower Works But No Warm Air

Here’s what could be wrong when you notice your heating system’s blower fan on, but you aren’t getting any heated air.

  • The duo of lights display alternating rapid flashes. This indicates your furnace ignitor might not be working. This component ignites fuel in your heater to produce warmth and should be fixed by a specialist from Assured Appliance and Heating & Air.

Turn to Us for Skilled Furnace Repair

When you need to have your HVAC equipment repaired without delay, turn to the experts at Assured Appliance and Heating & Air. Our techs will fix the issue quickly and have your home feeling cozy again soon. Contact us at 847-306-8990 or contact us online to request an appointment today.

Back To Blog