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

December 06, 2019

While your Lennox® HVAC equipment can’t speak to you, it possesses a way to communicate a furnace error.

Its control panel has a set of LED lights that can show a fault code. Based on the problem, your heating system could show continuous or flashing lights.

While there are some simple heating repairs you can complete yourself, many tasks are best handled by HVAC technicians. When your heating system won’t turn on or provide warm air, contact Moyer Total Indoor Comfort at 484-646-3363 for skilled furnace repair in Kutztown and Breinigsville.

Our specialists will rapidly pinpoint and take care of the failure, even if you don’t have a Lennox heater. We can repair whichever brands or makes—and get the warmth reintroduced to your residence without delay.


What Does the Flickering Light on My Heating System Mean?

Your heater depends on lights to flash code when it isn’t working right. It also works this setup to let you know it’s heating correctly.

Correct operation includes:

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

If you realize that a lone light flashing slowly and the other going on and off rapidly, your heater may have a low flame signal. This can occur even when your heater is operating like it should. It signifies the flame sensing rod could have build-up or in the bad location on the burner. Call us at 484-646-3363 for assistance.

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

Heater Won’t Kick On

Here are many of the light sequences you could notice when your heater refuses to or stay on. The majority of these errors have to be taken care of by a technician, like one from Moyer Total Indoor Comfort.

  1. All LED lights are extinguished. This indicates your HVAC system might not be receiving power. Examine the breaker box to make sure the heating system fuse has not triggered. Attempt to reset the fuse if it’s in the “off” area. If it promptly trips following a reset, leave the breaker alone and contact us at 484-646-3363.
  2. One light is unchanging and the other is blinking slowly. This signifies the flame rollout switch is may be malfunctioning. The component is an important safety mechanism that aids in stopping fires and carbon monoxide. You shouldn’t try to repair this malfunction without professional help.
  3. A single light is flashing quickly and the other is flashing slowly. This usually indicates power polarity has been inverted. Your heater might have a wiring issue that calls for specialized help from Moyer Total Indoor Comfort.
  4. The duo of lights are blinking slowly. This indicates your heating system’s blower motor possibly isn’t operating. This part circulates heated air from the heater into your rooms. We can help in figuring out what’s causing an issue with this component.
  5. An individual light is flickering slowly and the other is flashing rapidly. This indicates your furnace might have low voltage or a short circuit. Reach out to our professionals at 484-646-3363 for support.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there could be a malfunction with your heating system’s control panel or wiring. Moyer Total Indoor Comfort can find the issue and repair it.
  7. The pair of lights are using alternate slow blinks. This signifies your HVAC system possibly has a flame issue. There could be an issue with its gas supply, gas valve or ignitor control. Contact us at 484-646-3363 for assistance.
  8. An individual light blinks slowly while the other stays continuous. This often signifies your HVAC system’s limit switch is open. The switch stops your HVAC equipment from overheating. Reach out to the experts at Moyer Total Indoor Comfort for help.

Furnace Blower Works But No Warm Air

Here’s what may be wrong when you notice your heating system’s blower fan on, but you aren’t receiving any warmth.

  • Both lights display alternating rapid flashes. This indicates your furnace ignitor could be broken. This part ignites fuel in your furnace to create warmth and should be fixed by a specialist from Moyer Total Indoor Comfort.

Depend on Us for Skilled Furnace Repair

When you need to have your HVAC equipment in working order quickly, depend on the experts at Moyer Total Indoor Comfort. Our techs will handle the error quickly and have your house feeling comfortable again in no time. Contact us at 484-646-3363 or contact us online to get an appointment right away.