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 motherboard has two LED lights that can show a fault code. Based on the failure, your heater could display continuous or flashing lights.

Although there are some elementary HVAC fixes you can finish without an expert, the majority of tasks are best taken care of by the professionals. When your heating system refuses to kick on or provide warm air, get in touch with Fleming Heating & Air Conditioning Inc. at 877-389-2465 for experienced 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 whichever types or configuration—and get the heat reintroduced to your residence without delay.


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 let you know it’s operating properly.

Correct function consists of:

  • Concurrent slow flash—heater working correctly.
  • Simultaneous fast flash—heater is starting to call for heat.

If you see a solitary light blinking slowly and the other going on and off quickly, your furnace might 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 typical issues for Lennox HVAC systems.

Furnace Will Not Turn On

Here are many of the light arrangements you could notice when your furnace refuses to or keep heating. Most of these issues must be repaired by an expert, like one from Fleming Heating & Air Conditioning Inc..

  1. The pair of LED lights are extinguished. This signifies your heater might not have power. Check the breaker box to ensure the heating system fuse hasn’t flipped. Try resetting the fuse if it’s in the “off” area. If it instantly flips after you reset it, leave the breaker alone and contact us at 877-389-2465.
  2. A single light is unchanging and the other is flashing slowly. This means the flame rollout switch is probably open. The part is an essential safety guard that aids 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 flickering slowly. This often means power polarity has been inverted. Your furnace could have a wiring fault that calls for expert help from Fleming Heating & Air Conditioning Inc..
  4. All lights are flickering slowly. This signifies your furnace’s blower motor possibly isn’t running. This piece circulates warm air from the heater into your rooms. We can aid in determining what’s causing a problem with this part.
  5. An individual light is blinking slowly and the other is blinking fast. This indicates your heater may have insufficient voltage or a short circuit. Contact our professionals at 877-389-2465 for assistance.
  6. One light is blinking on, on and off while the other blinks on, off, on. This indicates there might be a problem with your heater’s control panel or wiring. Fleming Heating & Air Conditioning Inc. can determine the fault and take care of it.
  7. The pair of lights display alternate slow blinks. This signifies your furnace possibly has a flame failure. There could be trouble with its gas supply, gas valve or ignitor control. Reach out to us at 877-389-2465 for help.
  8. One light flashes slowly while the other is solid. This typically indicates your furnace’s limit switch is malfunctioning. The switch stops your heater from becoming too warm. Call the pros at Fleming Heating & Air Conditioning Inc. for assistance.

Heater Blower Operates But No Warmth

Here’s what may be wrong when you hear your furnace’s blower fan on, but you aren’t receiving any heated air.

  • The duo of lights are giving alternating fast flashes. This signifies your furnace ignitor may not be working. This part lights gas in your HVAC equipment to make warmth 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 repaired quickly, turn to the technicians at Fleming Heating & Air Conditioning Inc.. Our pros will handle the issue right away and have your home feeling cozy again in a short time. Contact us at 877-389-2465 or contact us online to schedule an appointment today.

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