Furnace troubleshooting

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

While your Lennox® heater cannot speak to you, it has a procedure to tell you about a furnace error.

Its motherboard has a set of LED lights that can show a fault code. Based on the failure, your furnace may display continuous or flashing lights.

Though there are various basic HVAC fixes you can do yourself, many services are best taken care of by the professionals. When your heater won’t start or deliver warm air, contact Scott Temperature at 785-269-0465 for skilled furnace repair in Lawrence.

Our technicians will speedily pinpoint and handle the breakdown, even if you don’t own a Lennox heating system. We can repair whichever kinds or configuration—and get the heat returned to your residence fast.


What Does the Blinking Light on My Heating System Mean?

Your furnace relies on lights to flash code when it is malfunctioning. It also works these lights to relay it’s operating properly.

Regular operation involves:

  • Simultaneous slow flash—heater operating properly.
  • Concurrent fast flash—heating system is starting to call for heat.

If you notice one light blinking slowly and the other flashing rapidly, your heater could be experiencing a low flame signal. This can occur even when your furnace is running properly. It means the flame sensing rod could be dirty or in the wrong location on the burner. Reach out to us at 785-269-0465 for help.

Here are some of the most routine errors for Lennox heating systems.

Heater Won’t Start

Here are some of the light arrangements you may see when your heating system won’t turn on or keep heating. The bulk of these issues need to be taken care of by an expert, such as one from Scott Temperature.

  1. All LED lights are off. This indicates your HVAC system might not have power. Examine the breaker box to make sure the furnace fuse has not flipped. Try resetting the fuse if it is in the “off” area. If it immediately trips after you reset it, don’t try to reset it again and get in touch with us us at 785-269-0465.
  2. A single light is stable and the other is flickering slowly. This implies the flame rollout switch is may be not working right. The component is an important safety device that aids in avoiding fires and carbon monoxide. You shouldn’t try to repair this issue yourself.
  3. An individual light is blinking fast and the other is flickering slowly. This likely means power polarity has been reversed. Your heating system could have a wiring problem that requires specialized support from Scott Temperature.
  4. All lights are blinking slowly. This means your heating system’s blower motor likely isn’t working. This part distributes heated air from the heater into your residence. We can help in figuring out what’s wrong with this part.
  5. An individual light is flickering slowly and the other is blinking quickly. This indicates your heating system might have low voltage or a short circuit. Call our professionals at 785-269-0465 for support.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there could be trouble with your heating system’s motherboard or wiring. Scott Temperature can locate the issue and handle it.
  7. The pair of lights are using alternating slow blinks. This signifies your HVAC equipment may have a flame issue. There might be trouble with its gas supply, gas valve or ignitor control. Contact us at 785-269-0465 for help.
  8. An individual light flickers slowly while the other stays solid. This typically means your furnace’s limit switch is malfunctioning. The switch prevents your heater from getting too hot. Call the pros at Scott Temperature for support.

Heating System Blower Runs But No Warm Air

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

  • The pair of lights are giving every other quick blinks. This signifies your furnace ignitor may not be working. This part lights gas in your furnace to create heat and should be repaired by an expert from Scott Temperature.

Depend on Us for Skilled Furnace Repair

When you need to get your furnace fixed without delay, turn to the experts at Scott Temperature. Our pros will handle the error right away and have your space feeling cozy again in a short time. Reach out to us at 785-269-0465 or contact us online to get an appointment today.

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