Furnace troubleshooting

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

While your Lennox® heater cannot talk to you, it possesses a way to communicate a furnace error.

Its motherboard has two LED lights that can share a fault code. Depending on the fault, your heater may display continuous or flashing lights.

Though there are a few simple furnace repairs you can finish on your own, most tasks are best taken care of by the professionals. When your heater won’t start or put out warm air, get in touch with Durable Service at 308-995-8177 for professional furnace repair in Holdrege.

Our technicians will swiftly detect and repair the failure, even if you don’t use a Lennox furnace. We can repair whichever kinds or models—and get the warmth returned to your residence without delay.


What Does the Blinking Light on My Heating System Mean?

Your heating system relies on lights to flash code when it requires repairs. It also works this system to relay it’s running like it should.

Correct heating involves:

  • Simultaneous slow flash—furnace operating properly.
  • Simultaneous fast flash—heating system is beginning to call for heat.

If you notice a solitary light flashing slowly and the other blinking rapidly, your furnace could be having a low flame signal. This can happen even when your heater is running like it should. It indicates the flame sensing rod could have build-up or in the bad area on the burner. Call us at 308-995-8177 for support.

Here are a few other of the most typical issues for Lennox heating systems.

Heating System Will Not Start

Here are many of the light arrangements you may see when your heater refuses to or keep running. The bulk of these issues have to be fixed by a specialist, like one from Durable Service .

  1. All LED lights aren’t lit. This signifies your heater might not be receiving power. Go to the breaker box to ensure the furnace fuse is not triggered. You should reset the fuse if it has moved into the “off” area. If it promptly flips after you reset it, leave the breaker alone and get in touch with us us at 308-995-8177.
  2. A single light is unchanging and the other is blinking slowly. This shows the flame rollout switch is likely open. The part is a critical safety mechanism that helps in preventing fires and carbon monoxide. You shouldn’t attempt to take care of this fault without professional help.
  3. An individual light is blinking fast and the other is flickering slowly. This often signifies power polarity has been inverted. Your heater could have a wiring error that requires professional assistance from Durable Service .
  4. The duo of lights are blinking slowly. This signifies your heater’s blower motor likely isn’t running. This piece sends hot air from the HVAC system into your residence. We can assist in figuring out what’s wrong with this component.
  5. An individual light is flickering slowly and the other is flashing fast. This signifies your HVAC system may have not enough voltage or a short circuit. Contact our specialists at 308-995-8177 for support.
  6. One light is flickering on, on and off while the other flickers on, off, on. This means there could be a problem with your furnace’s motherboard or wiring. Durable Service can locate the problem and handle it.
  7. The duo of lights display alternating slow flickers. This indicates your heating system likely has a flame failure. There may be a problem with its gas supply, gas valve or ignitor control. Call us at 308-995-8177 for help.
  8. An individual light blinks slowly while the other is steady. This typically means your heater’s limit switch is experiencing an error. The switch stops your HVAC system from getting too hot. Reach out to the specialists at Durable Service for assistance.

Heating System Blower Operates But No Warmth

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

  • Both lights are showing every other rapid blinks. This means your furnace ignitor may be broken. This piece ignites gas in your heating system to make heat and should be serviced by a professional from Durable Service .

Turn to Us for Skilled Furnace Repair

When you have to have your HVAC equipment fixed quickly, trust the experts at Durable Service . Our pros will take care of the issue promptly and have your rooms feeling relaxing again soon. Reach out to us at 308-995-8177 or contact us online to schedule an appointment right away.

Back To Blog