Furnace troubleshooting

Top Lennox® Furnace Error Codes (and What They Mean)

While your Lennox® furnace can’t speak to you, it has a procedure to communicate a furnace error.

Its control board has twin LED lights that can display a fault code. Based on the malfunction, your furnace could show steady or flashing lights.

Though there are certain elementary furnace adjustments you can finish yourself, most fixes are best taken care of by the professionals. When your heater will not start or provide warmth, get in touch with Freed Heating & Air Conditioning at 309-323-9584 for skilled furnace repair in Moline.

Our technicians will swiftly determine and fix the malfunction, even if you don’t own a Lennox heating system. We can fix all types or makes—and get the comfort reintroduced to your home quickly.


What Does the Flickering Light on My Heater Mean?

Your heating system depends on lights to flash code when it isn’t working right. It also works these lights to let you know it’s operating like it should.

Correct function involves:

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

If you realize that a lone light going on and off slowly and the other going on and off quickly, your heating system may be having a low flame signal. This can occur even when your heater is heating properly. It means the flame sensing rod might need to be cleaned or in the wrong area on the burner. Call us at 309-323-9584 for support.

Here are several other of the most common faults for Lennox furnaces.

Heating System Will Not Kick On

Here are a few of the light patterns you might notice when your heat won’t turn on or stay on. The majority of these errors must be repaired by a professional, like one from Freed Heating & Air Conditioning.

  1. The duo of LED lights aren’t lit. This indicates your heating system might not have power. Go to the breaker box to ensure the heater fuse hasn’t tripped. Attempt to reset the fuse if it is in the “off” spot. If it promptly turns off following a reset, don’t try to reset it again and call us at 309-323-9584.
  2. An individual light is unchanging and the other is flashing slowly. This means the flame rollout switch is probably malfunctioning. The switch is an essential safety mechanism that aids in avoiding fires and carbon monoxide. You shouldn’t try to handle this malfunction on your own.
  3. One light is blinking rapidly and the other is blinking slowly. This likely indicates power polarity has been reversed. Your furnace may have a wiring problem that requires specialized assistance from Freed Heating & Air Conditioning.
  4. The pair of lights are blinking slowly. This indicates your furnace’s blower motor possibly isn’t operating. This piece distributes heated air from the furnace into your house. We can aid in determining what’s wrong with this piece.
  5. A single light is flickering slowly and the other is flickering fast. This signifies your furnace might have low voltage or a short circuit. Get in touch with our experts at 309-323-9584 for support.
  6. One light is blinking on, on and off while the other flickers on, off, on. This means there could be a problem with your heater’s motherboard or wiring. Freed Heating & Air Conditioning can determine the issue and repair it.
  7. The pair of lights display alternating slow flashes. This means your HVAC equipment likely has a flame issue. There might be a problem with its gas supply, gas valve or ignitor control. Reach out to us at 309-323-9584 for help.
  8. An individual light flickers slowly while the other stays steady. This typically means your furnace’s limit switch is malfunctioning. The switch stops your heater from getting too hot. Contact the pros at Freed Heating & Air Conditioning for help.

Furnace Blower Operates But No Warmth

Here’s what might be broken when you notice your heating equipment’s blower fan working, but you aren’t getting any warm air.

  • Both lights display alternate rapid flashes. This signifies your furnace ignitor could not be working. This piece ignites energy in your furnace to make heat and should be fixed by a professional from Freed Heating & Air Conditioning.

Trust Us for Professional Furnace Repair

When you need to have your HVAC equipment repaired fast, turn to the specialists at Freed Heating & Air Conditioning. Our pros will repair the issue quickly and have your space feeling cozy again in a short time. Contact us at 309-323-9584 or contact us online to request an appointment now.

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