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

December 06, 2019

While your Lennox® heater cannot talk to you, it does have a process to get your attention when there’s a furnace error.

Its motherboard has twin LED lights that can display a fault code. Based on the malfunction, your heater may use continuous or flashing lights.

Though there are some simple heating fixes you can finish yourself, many repairs are best left to HVAC technicians. When your heating system refuses to kick on or give warmth, contact West Michigan Heating & Air Conditioning Services at (616) 319-1436 for experienced furnace repair in Hudsonville.

Our technicians will speedily diagnose and take care of the problem, even if you don’t have a Lennox heating system. We can repair all kinds or models—and get the comfort reintroduced to your house quickly.


What Does the Flickering Light on My Heating System Mean?

Your heater depends on lights to flash code when it is malfunctioning. It also works this system to relay it’s operating properly.

Regular operation includes:

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

If you see a single light flashing slowly and the other blinking quickly, your furnace could be experiencing a low flame signal. This can take place even when your heating system is operating like it should. It indicates the flame sensing rod could have build-up or in the wrong area on the burner. Reach out to us at (616) 319-1436 for assistance.

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

Heating System Won’t Start

Here are many of the light sequences you could observe when your heater refuses to or keep running. The bulk of these errors have to be repaired by an expert, such as one from West Michigan Heating & Air Conditioning Services.

  1. All LED lights are extinguished. This indicates your heating system might not be receiving power. Go to the breaker box to make sure the furnace fuse has not flipped. Try resetting the fuse if it has moved into the “off” spot. If it instantly turns off after a subsequent reset, don’t touch the breaker and get in touch with us us at (616) 319-1436.
  2. A single light is solid and the other is flashing slowly. This means the flame rollout switch is likely open. The component is a critical safety device that aids in avoiding fires and carbon monoxide. You shouldn’t seek to take care of this fault yourself.
  3. An individual light is blinking fast and the other is blinking slowly. This often indicates power polarity has been transposed. Your heater might have a wiring error that requires professional help from West Michigan Heating & Air Conditioning Services.
  4. The pair of lights are flashing slowly. This means your heater’s blower motor likely isn’t working. This component sends hot air from the heating system into your space. We can assist in determining what’s wrong with this part.
  5. One light is flashing slowly and the other is flashing rapidly. This signifies your heater might have insufficient voltage or a short circuit. Reach out to our specialists at (616) 319-1436 for help.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there may be trouble with your heater’s control board or wiring. West Michigan Heating & Air Conditioning Services can locate the issue and fix it.
  7. The duo of lights show every other slow flashes. This indicates your heater likely has a flame issue. There might be an issue with its gas supply, gas valve or ignitor control. Reach out to us at (616) 319-1436 for support.
  8. A single light blinks slowly while the other stays continuous. This often signifies your heater’s limit switch is not working. The switch keeps your HVAC equipment from getting too hot. Call the pros at West Michigan Heating & Air Conditioning Services for assistance.

Heating System Blower Works But No Warm Air

Here’s what might be wrong when you hear your heating system’s blower fan on, but you aren’t receiving any warmth.

  • The duo of lights are giving every other quick flickers. This indicates your furnace ignitor might not be in working order. This piece lights fuel in your heating system to make heat and should be repaired by an expert from West Michigan Heating & Air Conditioning Services.

Depend on Us for Professional Furnace Repair

When you have to have your furnace in working order without delay, turn to the technicians at West Michigan Heating & Air Conditioning Services. Our techs will repair the fault quickly and have your rooms feeling cozy again soon. Reach out to us at (616) 319-1436 or contact us online to get an appointment right away.