Furnace troubleshooting

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

While your Lennox® HVAC equipment isn’t able to speak to you, it has a procedure to communicate a furnace error.

Its motherboard has two LED lights that can share a fault code. Subject to the issue, your furnace may use steady or flashing lights.

Although there are certain elementary heating adjustments you can finish on your own, most repairs are best handled by HVAC technicians. When your heater won’t turn on or give heat, get in touch with Tri County Air Care LLC at 469-213-8367 for expert furnace repair in Dallas.

Our experts will rapidly identify and fix the issue, even if you don’t have a Lennox heating system. We can service all types or models—and get the heat reintroduced to your residence fast.


What Does the Flickering Light on My Heater Mean?

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

Normal function includes:

  • Concurrent slow flash—furnace heating correctly.
  • Both lights flash fast—furnace is beginning to call for heat.

If you notice a solitary light blinking slowly and the other flashing quickly, your heater could be having a low flame signal. This can occur even when your furnace is heating properly. It indicates the flame sensing rod could need to be cleaned or in the incorrect area on the burner. Reach out to us at 469-213-8367 for assistance.

Here are several other of the most common errors for Lennox furnaces.

Furnace Refuses to Kick On

Here are some of the light patterns you could see when your furnace refuses to or keep running. Most of these problems have to be repaired by an expert, for instance from Tri County Air Care LLC.

  1. Both LED lights are extinguished. This means your heating system might not be receiving power. Find the breaker box to ensure the furnace fuse is not triggered. Try resetting the fuse if it’s in the “off” spot. If it immediately turns off after you reset it, leave the breaker alone and call us at 469-213-8367.
  2. An individual light is unchanging and the other is flashing slowly. This signifies the flame rollout switch is probably malfunctioning. The switch is an essential safety tool that helps in avoiding fires and carbon monoxide. You shouldn’t attempt to take care of this issue yourself.
  3. An individual light is blinking fast and the other is blinking slowly. This usually means power polarity has been transposed. Your heating system might have a wiring problem that calls for expert help from Tri County Air Care LLC.
  4. The pair of lights are flashing slowly. This signifies your furnace’s blower motor possibly isn’t running. This component sends hot air from the heater into your home. We can help in figuring out what’s causing an issue with this component.
  5. An individual light is flickering slowly and the other is blinking fast. This signifies your heating system could have insufficient voltage or a short circuit. Call our experts at 469-213-8367 for assistance.
  6. One light is blinking on, on and off while the other blinks on, off, on. This signifies there may be an error with your heater’s control panel or wiring. Tri County Air Care LLC can determine the problem and fix it.
  7. The duo of lights are using every other slow flickers. This signifies your HVAC system likely has a flame failure. There might be a problem with its gas supply, gas valve or ignitor control. Contact us at 469-213-8367 for support.
  8. An individual light blinks slowly while the other stays solid. This often means your HVAC equipment’s limit switch is not working. The switch keeps your heating system from getting too hot. Call the specialists at Tri County Air Care LLC for support.

Heating System Blower Works But No Heat

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

  • Both lights are showing alternating quick flickers. This means your furnace ignitor might be broken. This piece ignites gas in your heater to produce warmth and should be fixed by a professional from Tri County Air Care LLC.

Depend on Us for Skilled Furnace Repair

When you need to get your heater in working order without delay, trust the technicians at Tri County Air Care LLC. Our techs will fix the issue without delay and have your rooms feeling cozy again soon. Reach out to us at 469-213-8367 or contact us online to schedule an appointment right away.

Back To Blog