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

December 06, 2019

While your Lennox® heating system cannot chat with you, it possesses a process to communicate a furnace error.

Its motherboard has a set of LED lights that can show a fault code. Depending on the fault, your heater may show continuous or flashing lights.

Although there are various simple furnace repairs you can take care of yourself, most fixes are best taken care of by the professionals. When your furnace refuses to kick on or give warm air, contact Air Alliance Team at 636-206-4250 for skilled furnace repair in Ballwin and St. Charles.

Our experts will rapidly discover and handle the problem, even if you don’t own a Lennox heater. We can repair any kinds or makes—and get the comfort returned to your house fast.

REQUEST FURNACE REPAIR

What Does the Blinking Light on My Heating System Mean?

Your heater relies on lights to flash code when it is malfunctioning. It also engages this system to tell you it’s heating properly.

Normal heating includes:

  • Concurrent slow flash—furnace working correctly.
  • Simultaneous fast flash—heating system is starting to call for heat.

If you realize that a single light blinking slowly and the other blinking rapidly, your heating system may be having a low flame signal. This can happen even when your heater is working like it should. It indicates the flame sensing rod may be dirty or in the bad location on the burner. Contact us at 636-206-4250 for support.

Here are several other of the most typical problems for Lennox furnaces.

Heater Refuses to Start

Here are some of the light patterns you may see when your furnace will not or keep operating. Most of these problems must be fixed by a professional, like one from Air Alliance Team.

  1. All LED lights are off. This indicates your heater might not have power. Examine the breaker box to ensure the heating system fuse isn’t triggered. You should reset the fuse if it has moved into the “off” position. If it rapidly trips after you reset it, don’t try to reset it again and contact us at 636-206-4250.
  2. A single light is stable and the other is flickering slowly. This shows the flame rollout switch is likely open. The part is a critical safety mechanism that aids in avoiding fires and carbon monoxide. You shouldn’t try to handle this malfunction on your own.
  3. A single light is blinking rapidly and the other is flickering slowly. This likely indicates power polarity has been inverted. Your furnace could have a wiring issue that calls for expert aid from Air Alliance Team.
  4. All lights are flashing slowly. This signifies your furnace’s blower motor possibly isn’t running. This piece sends heated air from the furnace into your rooms. We can aid in pinpointing what’s causing an issue with this piece.
  5. A single light is blinking slowly and the other is flashing rapidly. This signifies your heating system may have not enough voltage or a short circuit. Call our technicians at 636-206-4250 for help.
  6. One light is flickering on, on and off while the other flickers on, off, on. This signifies there could be a malfunction with your heater’s control board or wiring. Air Alliance Team can pinpoint the issue and take care of it.
  7. Both lights are using alternating slow blinks. This indicates your HVAC system possibly has a flame problem. There could be a problem with its gas supply, gas valve or ignitor control. Contact us at 636-206-4250 for assistance.
  8. One light flickers slowly while the other remains solid. This often means your heating system’s limit switch is malfunctioning. The switch prevents your heater from getting too hot. Contact the pros at Air Alliance Team for help.

Heating System Blower Works But No Warmth

Here’s what might be wrong when you hear your heating equipment’s blower fan running, but you aren’t receiving any warm air.

  • The duo of lights are showing every other fast flickers. This signifies your furnace ignitor may not be in working order. This component lights fuel in your heater to produce warmth and should be repaired by an expert from Air Alliance Team.

Trust Us for Skilled Furnace Repair

When you have to get your heating system in working order quickly, depend on the technicians at Air Alliance Team. Our techs will take care of the issue promptly and have your house feeling relaxing again in a short time. Contact us at 636-206-4250 or contact us online to request an appointment now.