Furnace troubleshooting

Top Lennox® Furnace Error Codes (and What They Mean)

While your Lennox® heating system can’t talk to you, it possesses a process to communicate a furnace error.

Its control panel has two LED lights that can show a fault code. Based on the failure, your heater could show steady or flashing lights.

While there are various elementary heating fixes you can finish on your own, many repairs are best taken care of by HVAC technicians. When your furnace won’t turn on or put out warmth, contact Airtronic Heating & Cooling at 313-230-4053 for professional furnace repair in Redford.

Our experts will rapidly determine and take care of the breakdown, even if you don’t have a Lennox heating system. We can service any brands or models—and get the warmth returned to your house fast.


What Does the Flashing Light on My Heater Mean?

Your heating system relies on lights to flash code when it requires repairs. It also engages these lights to let you know it’s working properly.

Regular function involves:

  • Concurrent slow flash—heater working like it should.
  • Simultaneous fast flash—furnace is beginning to call for heat.

If you realize that one light blinking slowly and the other flashing quickly, your furnace may be experiencing a low flame signal. This can happen even when your heater is heating like it should. It means the flame sensing rod could be dirty or in the wrong spot on the burner. Contact us at 313-230-4053 for support.

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

Heater Will Not Start

Here are many of the light patterns you may see when your furnace refuses to or keep running. The bulk of these issues need to be handled by a specialist, like one from Airtronic Heating & Cooling.

  1. All LED lights aren’t lit. This signifies your furnace might not have electricity. Look at the breaker box to ensure the heater fuse has not flipped. You should reset the fuse if it is in the “off” area. If it immediately flips after a subsequent reset, don’t try to reset it again and contact us at 313-230-4053.
  2. An individual light is stable and the other is flashing slowly. This implies the flame rollout switch is may be open. The part is a critical safety guard that assists in stopping fires and carbon monoxide. You shouldn’t seek to fix this issue on your own.
  3. A single light is flickering quickly and the other is flickering slowly. This usually means power polarity has been transposed. Your heater may have a wiring problem that calls for expert support from Airtronic Heating & Cooling.
  4. All lights are blinking slowly. This indicates your heater’s blower motor probably isn’t running. This part distributes warm air from the heater into your residence. 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 indicates your heating system could have insufficient voltage or a short circuit. Reach out to our technicians at 313-230-4053 for support.
  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 HVAC system’s control board or wiring. Airtronic Heating & Cooling can pinpoint the error and fix it.
  7. Both lights are using alternate slow flashes. This signifies your HVAC system possibly has a flame error. There might be trouble with its gas supply, gas valve or ignitor control. Contact us at 313-230-4053 for help.
  8. An individual light flashes slowly while the other remains continuous. This usually indicates your HVAC system’s limit switch is not working. The switch keeps your HVAC system from getting too hot. Reach out to the experts at Airtronic Heating & Cooling for support.

Furnace Blower Operates But No Heat

Here’s what might be broken when you notice your heater’s blower fan running, but you aren’t getting any warm air.

  • The duo of lights display alternate quick flickers. This indicates your furnace ignitor may be broken. This piece lights energy in your heater to produce heat and should be fixed by a specialist from Airtronic Heating & Cooling.

Depend on Us for Expert Furnace Repair

When you have to get your heater fixed quickly, depend on the professionals at Airtronic Heating & Cooling. Our techs will repair the fault quickly and have your home feeling relaxing again in no time. Call us at 313-230-4053 or contact us online to request an appointment right away.

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