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

December 06, 2019

While your Lennox® HVAC equipment can’t talk to you, it has a process to get your attention when there’s a furnace error.

Its control panel has twin LED lights that can display a fault code. Depending on the problem, your furnace might show continuous or flashing lights.

While there are some simple HVAC adjustments you can take care of without an expert, many services are best left to the professionals. When your furnace will not kick on or provide heat, contact AC Sales at (337) 234-2345 for expert furnace repair in Lafayette.

Our specialists will swiftly determine and fix the breakdown, even if you don’t have a Lennox furnace. We can fix all kinds or models—and get the warmth restored to your home without delay.

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What Does the Blinking Light on My Heater Mean?

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

Correct function consists of:

  • Simultaneous slow flash—furnace running correctly.
  • Both lights flash fast—furnace is initiating the call for heat.

If you notice a lone light going on and off slowly and the other blinking rapidly, your furnace may be experiencing a low flame signal. This can take place even when your furnace is working properly. It means the flame sensing rod may need to be cleaned or in the bad spot on the burner. Call us at (337) 234-2345 for support.

Here are a few other of the most common faults for Lennox HVAC systems.

Heater Refuses to Turn On

Here are many of the light patterns you may notice when your heater will not or keep heating. Most of these errors need to be handled by a specialist, for instance from AC Sales.

  1. The duo of LED lights are extinguished. This indicates your HVAC system might not be receiving power. Find the breaker box to confirm the furnace fuse isn’t flipped. Try resetting the fuse if it is in the “off” spot. If it rapidly trips after a subsequent reset, don’t try to reset it again and contact us at (337) 234-2345.
  2. An individual light is continuous and the other is flickering slowly. This means the flame rollout switch is possibly open. The part is an essential safety tool that aids in avoiding fires and carbon monoxide. You shouldn’t attempt to fix this issue yourself.
  3. An individual light is blinking rapidly and the other is blinking slowly. This usually signifies power polarity has been reversed. Your furnace may have a wiring problem that requires professional assistance from AC Sales.
  4. Both lights are flickering slowly. This means your furnace’s blower motor possibly isn’t working. This piece sends warm air from the heater into your space. We can help in pinpointing what’s causing a problem with this part.
  5. An individual light is blinking slowly and the other is flickering quickly. This signifies your furnace may have insufficient voltage or a short circuit. Call our experts at (337) 234-2345 for help.
  6. One light is flashing on, on and off while the other flickers on, off, on. This signifies there may be a malfunction with your heating system’s motherboard or wiring. AC Sales can locate the problem and fix it.
  7. The pair of lights show every other slow blinks. This signifies your HVAC system possibly has a flame issue. There may be a problem with its gas supply, gas valve or ignitor control. Reach out to us at (337) 234-2345 for support.
  8. An individual light flickers slowly while the other is solid. This typically signifies your HVAC equipment’s limit switch is experiencing an error. The switch keeps your HVAC equipment from getting too hot. Reach out to the pros at AC Sales for support.

Furnace Blower Operates But No Warm Air

Here’s what could be wrong when you notice your heater’s blower fan running, but you aren’t receiving any heated air.

  • Both lights display every other quick flashes. This signifies your furnace ignitor might not be working. This part lights fuel in your heating system to create warmth and should be fixed by an expert from AC Sales.

Trust Us for Professional Furnace Repair

When you need to have your furnace in working order quickly, trust the experts at AC Sales. Our pros will fix the fault quickly and have your home feeling comfortable again soon. Reach out to us at (337) 234-2345 or contact us online to get an appointment right away.