Furnace troubleshooting

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

While your Lennox® furnace can’t talk to you, it does have a process to tell you about a furnace error.

Its control panel has twin LED lights that can display a fault code. Depending on the malfunction, your heater could show continuous or flashing lights.

While there are various elementary HVAC fixes you can complete on your own, many tasks are best taken care of by the professionals. When your furnace won’t start or provide heated air, contact Booneville Heating & Cooling LLC at 662-269-8716 for expert furnace repair in Booneville.

Our specialists will quickly detect and repair the breakdown, even if you don’t have a Lennox furnace. We can service whichever types or configuration—and get the warmth returned to your home quickly.


What Does the Blinking Light on My Heating System Mean?

Your heater uses lights to flash code when it requires repairs. It also engages this setup to relay it’s running correctly.

Normal function includes:

  • Concurrent slow flash—furnace running correctly.
  • Both lights flash fast—heater is starting to call for heat.

If you see a lone light blinking slowly and the other going on and off rapidly, your heater may have a low flame signal. This can take place even when your heating system is operating correctly. It means the flame sensing rod could have build-up or in the wrong location on the burner. Contact us at 662-269-8716 for help.

Here are some of the most common errors for Lennox HVAC systems.

Heater Won’t Kick On

Here are many of the light arrangements you may notice when your furnace will not or keep running. The majority of these issues have to be handled by a technician, for instance from Booneville Heating & Cooling LLC.

  1. Both LED lights are extinguished. This signifies your HVAC system might not have electricity. Look at the breaker box to ensure the furnace fuse hasn’t tripped. Attempt to reset the fuse if it is in the “off” area. If it promptly flips after you reset it, don’t touch the breaker and contact us at 662-269-8716.
  2. An individual light is unchanging and the other is blinking slowly. This means the flame rollout switch is likely open. The switch is a critical safety tool that assists in avoiding fires and carbon monoxide. You shouldn’t attempt to handle this malfunction on your own.
  3. One light is flashing fast and the other is flickering slowly. This likely indicates power polarity has been reversed. Your heating system may have a wiring error that calls for expert aid from Booneville Heating & Cooling LLC.
  4. The pair of lights are flashing slowly. This signifies your heater’s blower motor possibly isn’t operating. This piece moves hot air from the heating system into your residence. We can aid in figuring out what’s causing an issue with this piece.
  5. A single light is blinking slowly and the other is flashing rapidly. This signifies your heater might have insufficient voltage or a short circuit. Call our professionals at 662-269-8716 for help.
  6. One light is flickering on, on and off while the other flickers on, off, on. This signifies there might be an issue with your heater’s control board or wiring. Booneville Heating & Cooling LLC can find the error and fix it.
  7. The pair of lights show alternate slow flickers. This signifies your heater possibly has a flame failure. There could be a problem with its gas supply, gas valve or ignitor control. Contact us at 662-269-8716 for support.
  8. One light flickers slowly while the other remains steady. This typically signifies your heater’s limit switch is experiencing an error. The switch keeps your heater from overheating. Get in touch with the pros at Booneville Heating & Cooling LLC for support.

Heating System Blower Operates But No Warm Air

Here’s what might be wrong when you notice your heating system’s blower fan working, but you aren’t gaining any warm air.

  • The pair of lights are giving alternating rapid blinks. This signifies your furnace ignitor may not be working. This piece kindles gas in your heating system to produce warmth and should be fixed by a professional from Booneville Heating & Cooling LLC.

Trust Us for Expert Furnace Repair

When you need to get your furnace fixed quickly, trust the technicians at Booneville Heating & Cooling LLC. Our technicians will fix the problem quickly and have your home feeling cozy again soon. Reach out to us at 662-269-8716 or contact us online to schedule an appointment right away.

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