Furnace troubleshooting

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

While your Lennox® furnace can’t speak to you, it possesses a process to get your attention when there’s a furnace error.

Its control board has twin LED lights that can display a fault code. Subject to the problem, your furnace might display steady or flashing lights.

Although there are certain elementary furnace adjustments you can finish yourself, the majority of fixes are best taken care of by the professionals. When your heater refuses to kick on or give warmth, get in touch with Freed Heating & Air Conditioning at 309-323-9584 for skilled furnace repair in Moline.

Our technicians will swiftly spot and fix the malfunction, even if you don’t use a Lennox heater. We can fix all types or makes—and get the comfort reintroduced to your home without delay.


What Does the Flashing Light on My Heating System Mean?

Your heater relies on lights to flash code when it isn’t working right. It also works these lights to let you know it’s running like it should.

Regular function involves:

  • Both lights flash slowly—furnace working correctly.
  • Simultaneous fast flash—heater is starting to call for heat.

If you realize that a lone light blinking slowly and the other blinking quickly, your heating system may be having a low flame signal. This can take place even when your heater is heating like it should. 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 some of the most common faults for Lennox heating systems.

Heater Will Not Start

Here are a few of the light sequences you might notice when your heater won’t turn on or stay on. The majority of these errors need to be repaired by an expert, such as one from Freed Heating & Air Conditioning.

  1. All LED lights aren’t lit. This indicates your heating system might not have power. Go to the breaker box to ensure the heater fuse isn’t tripped. Attempt to reset the fuse if it’s in the “off” spot. If it immediately turns off after a subsequent reset, don’t touch the breaker and call us at 309-323-9584.
  2. An individual light is solid and the other is flashing slowly. This shows the flame rollout switch is probably malfunctioning. The switch is a critical safety tool that assists in stopping fires and carbon monoxide. You shouldn’t try to handle this malfunction without professional help.
  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 expert assistance from Freed Heating & Air Conditioning.
  4. The pair of lights are blinking slowly. This indicates your furnace’s blower motor likely isn’t running. This component distributes hot air from the heater into your residence. We can aid in determining what’s wrong with this piece.
  5. An individual light is flickering slowly and the other is flickering rapidly. This indicates your heater might have low voltage or a short circuit. Get in touch with our professionals at 309-323-9584 for assistance.
  6. One light is blinking on, on and off while the other blinks on, off, on. This means there could be an issue with your heater’s control panel or wiring. Freed Heating & Air Conditioning can determine the issue and repair it.
  7. The duo 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. Call us at 309-323-9584 for help.
  8. An individual light blinks slowly while the other stays steady. This typically means your furnace’s limit switch is malfunctioning. The switch stops your heater from overheating. Get in touch with the pros at Freed Heating & Air Conditioning for support.

Furnace Blower Works But No Warm Air

Here’s what may be at fault when you hear your heating equipment’s blower fan working, but you aren’t getting any warm air.

  • Both lights display every other quick flashes. This indicates your furnace ignitor could not be working. This component ignites energy in your furnace to create heat and should be fixed by an expert from Freed Heating & Air Conditioning.

Trust Us for Skilled Furnace Repair

When you need to get your HVAC equipment in working order without delay, turn to the specialists at Freed Heating & Air Conditioning. Our pros will repair the issue quickly and have your space feeling cozy again soon. Contact us at 309-323-9584 or contact us online to request an appointment right away.

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