Furnace troubleshooting

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

While your Lennox® heater can’t speak to you, it possesses a way to tell you about a furnace error.

Its control panel has a set of LED lights that can share a fault code. Based on the fault, your heater could use steady or flashing lights.

While there are some simple heating fixes you can do on your own, the majority of tasks are best taken care of by experts. When your furnace refuses to turn on or give heat, call Climate Control Systems at 828-283-0369 for professional furnace repair in Hickory.

Our technicians will quickly identify and fix the failure, even if you don’t own a Lennox furnace. We can service any types or configuration—and get the comfort returned to your residence fast.


What Does the Flickering Light on My Furnace Mean?

Your heating system uses lights to flash code when it is malfunctioning. It also engages this setup to let you know it’s heating like it should.

Correct function includes:

  • Simultaneous slow flash—heating system working like it should.
  • Concurrent fast flash—heater is starting to call for heat.

If you see one light flashing slowly and the other blinking rapidly, your furnace could be having a low flame signal. This can occur even when your furnace is running correctly. It indicates the flame sensing rod could be dirty or in the incorrect location on the burner. Call us at 828-283-0369 for help.

Here are some of the most routine problems for Lennox heating systems.

Heating System Won’t Kick On

Here are some of the light arrangements you might notice when your furnace won’t turn on or keep running. The bulk of these errors must be taken care of by a professional, such as one from Climate Control Systems.

  1. The pair of LED lights aren’t lit. This means your heater might not have electricity. Find the breaker box to ensure the furnace fuse is not tripped. Try resetting the fuse if it has moved into the “off” position. If it rapidly flips after a subsequent reset, don’t try to reset it again and contact us at 828-283-0369.
  2. A single light is unchanging and the other is blinking slowly. This means the flame rollout switch is probably not working right. The switch is an essential safety mechanism that assists in preventing fires and carbon monoxide. You shouldn’t attempt to fix this issue yourself.
  3. An individual light is blinking quickly and the other is blinking slowly. This likely signifies power polarity has been reversed. Your heating system may have a wiring issue that calls for expert assistance from Climate Control Systems.
  4. The pair of lights are flashing slowly. This signifies your heater’s blower motor possibly isn’t operating. This piece sends hot air from the furnace into your space. We can help in figuring out what’s causing a problem with this piece.
  5. One light is blinking slowly and the other is flashing rapidly. This indicates your furnace could have insufficient voltage or a short circuit. Call our experts at 828-283-0369 for assistance.
  6. One light is blinking on, on and off while the other blinks on, off, on. This means there might be a malfunction with your heating system’s control board or wiring. Climate Control Systems can find the fault and fix it.
  7. Both lights are using alternate slow flashes. This indicates your HVAC system likely has a flame problem. There may be an issue with its gas supply, gas valve or ignitor control. Get in touch with us at 828-283-0369 for support.
  8. One light flashes slowly while the other stays steady. This often indicates your heating system’s limit switch is experiencing an error. The switch keeps your HVAC system from getting too hot. Reach out to the specialists at Climate Control Systems for assistance.

Furnace Blower Works But No Heat

Here’s what may be broken when you hear your furnace’s blower fan on, but you aren’t getting any heat.

  • Both lights display alternating rapid blinks. This signifies your furnace ignitor might be broken. This piece ignites gas in your HVAC equipment to make heat and should be serviced by a specialist from Climate Control Systems.

Turn to Us for Expert Furnace Repair

When you have to have your furnace repaired quickly, turn to the experts at Climate Control Systems. Our pros will handle the error promptly and have your residence feeling cozy again soon. Contact us at 828-283-0369 or contact us online to get an appointment now.

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