Furnace troubleshooting

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

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

Its control panel has two LED lights that can show a fault code. Based on the issue, your heater could display continuous or flashing lights.

Though there are some elementary heating adjustments you can do on your own, the majority of tasks are best taken care of by the professionals. When your heating system refuses to kick on or give warm air, get in touch with Fleming Heating & Air Conditioning Inc. at 877-389-2465 for expert furnace repair in South Beloit and Belvidere.

Our experts will swiftly determine and take care of the malfunction, even if you don’t use a Lennox furnace. We can repair all kinds or configuration—and get the heat returned to your house quickly.


What Does the Flickering Light on My Furnace Mean?

Your heater uses lights to flash code when it requires repairs. It also engages these lights to relay it’s running properly.

Regular function consists of:

  • Simultaneous slow flash—heater operating correctly.
  • Simultaneous fast flash—heater is beginning to call for heat.

If you see one light blinking slowly and the other blinking quickly, your furnace could be having a low flame signal. This can occur even when your heater is working correctly. It signifies the flame sensing rod might be dirty or in the incorrect spot on the burner. Call us at 877-389-2465 for support.

Here are several other of the most routine faults for Lennox HVAC systems.

Furnace Refuses to Turn On

Here are many of the light arrangements you could observe when your furnace refuses to or stay on. The bulk of these issues must be repaired by a professional, such as one from Fleming Heating & Air Conditioning Inc..

  1. The pair of LED lights are extinguished. This means your heater might not have power. Find the breaker box to confirm the heating system fuse hasn’t triggered. Try resetting the fuse if it is in the “off” spot. If it instantly turns off after you reset it, leave the breaker alone and get in touch with us us at 877-389-2465.
  2. An individual light is unchanging and the other is flashing slowly. This means the flame rollout switch is probably open. The component is a critical safety guard that assists in preventing fires and carbon monoxide. You shouldn’t attempt to handle this malfunction on your own.
  3. One light is flashing quickly and the other is blinking slowly. This often means power polarity has been transposed. Your furnace could have a wiring error that needs expert support from Fleming Heating & Air Conditioning Inc..
  4. All lights are blinking slowly. This indicates your furnace’s blower motor possibly isn’t operating. This piece moves warm air from the furnace into your rooms. We can aid in determining what’s causing a problem with this part.
  5. An individual light is flickering slowly and the other is flickering fast. This signifies your furnace may have insufficient voltage or a short circuit. Contact our experts at 877-389-2465 for support.
  6. One light is flickering on, on and off while the other blinks on, off, on. This indicates there might be an issue with your heater’s motherboard or wiring. Fleming Heating & Air Conditioning Inc. can determine the issue and repair it.
  7. The pair of lights are using alternate slow blinks. This signifies your furnace likely has a flame issue. There could be an issue with its gas supply, gas valve or ignitor control. Call us at 877-389-2465 for help.
  8. One light flashes slowly while the other is solid. This often indicates your furnace’s limit switch is malfunctioning. The switch keeps your heater from becoming too warm. Call the pros at Fleming Heating & Air Conditioning Inc. for assistance.

Heating System Blower Operates But No Warm Air

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

  • The pair of lights are showing alternating fast flashes. This indicates your furnace ignitor may not be working. This part kindles fuel in your HVAC equipment to create warm air and should be serviced by an expert from Fleming Heating & Air Conditioning Inc..

Trust Us for Expert Furnace Repair

When you have to get your HVAC equipment in working order quickly, turn to the technicians at Fleming Heating & Air Conditioning Inc.. Our pros will handle the issue right away and have your rooms feeling cozy again soon. Contact us at 877-389-2465 or contact us online to schedule an appointment today.

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