Furnace troubleshooting

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

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

Its control panel has two LED lights that can show a fault code. Subject to the failure, your heater could show solid or flashing lights.

While there are various elementary heating fixes you can do without an expert, 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 specialists 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 comfort returned to your house fast.


What Does the Flickering Light on My Heater Mean?

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

Regular heating includes:

  • Concurrent slow flash—heater operating like it should.
  • Simultaneous fast flash—heating system is starting to call for heat.

If you notice 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 properly. It means the flame sensing rod may be dirty or in the wrong spot on the burner. Reach out to us at 313-230-4053 for support.

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

Heater Refuses to Kick On

Here are many of the light patterns you may see when your furnace will not or keep running. Most of these issues must be handled by a specialist, like one from Airtronic Heating & Cooling.

  1. All LED lights are extinguished. This signifies your furnace might not have electricity. Examine the breaker box to confirm the heating system fuse has not flipped. You should reset the fuse if it is in the “off” spot. If it immediately turns off following a reset, don’t touch the breaker and get in touch with us us at 313-230-4053.
  2. A single light is stable and the other is flashing slowly. This implies the flame rollout switch is may be open. The part is an essential safety guard that aids in stopping fires and carbon monoxide. You shouldn’t seek to take care of this issue on your own.
  3. An individual light is flickering quickly and the other is flickering slowly. This usually means power polarity has been inverted. Your heating system may have a wiring problem that needs expert help from Airtronic Heating & Cooling.
  4. All lights are flickering slowly. This signifies your heating system’s blower motor probably isn’t running. This part distributes warm air from the furnace into your house. 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 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 flickering 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 find the error and fix it.
  7. Both lights are using alternate slow flashes. This indicates your HVAC system likely has a flame error. There might be an issue with its gas supply, gas valve or ignitor control. Contact us at 313-230-4053 for help.
  8. A single light flashes slowly while the other stays continuous. This usually indicates your heater’s limit switch is not working. The switch stops your HVAC system from getting too hot. Reach out to the experts at Airtronic Heating & Cooling for support.

Furnace Blower Works But No Heat

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

  • The duo of lights display alternate quick blinks. 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.

Turn to Us for Expert Furnace Repair

When you have to get your heater fixed quickly, trust the professionals at Airtronic Heating & Cooling. Our pros will repair the fault quickly and have your rooms feeling cozy again in no time. Reach out to us at 313-230-4053 or contact us online to request an appointment now.

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