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

December 06, 2019

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

Its control board has a set of LED lights that can display a fault code. Subject to the malfunction, your heating system could display steady or flashing lights.

Though there are certain basic HVAC repairs you can do yourself, many repairs are best left to the professionals. When your heating system won’t turn on or give heat, reach out to Central Air LLC at 203-357-5913 for experienced furnace repair in Brookfield.

Our specialists will rapidly determine and handle the breakdown, even if you don’t own a Lennox heater. We can repair whichever kinds or models—and get the comfort returned to your house without delay.


What Does the Blinking Light on My Heater Mean?

Your heater uses lights to flash code when it needs to be repaired. It also engages this setup to let you know it’s working properly.

Regular operation includes:

  • Simultaneous slow flash—furnace operating correctly.
  • Concurrent fast flash—heating system is initiating the call for heat.

If you realize that a solitary light going on and off slowly and the other flashing fast, your furnace might be having a low flame signal. This can take place even when your heating system is heating like it should. It signifies the flame sensing rod might need to be cleaned or in the bad area on the burner. Call us at 203-357-5913 for support.

Here are several other of the most routine errors for Lennox heating systems.

Heating System Will Not Turn On

Here are a few of the light arrangements you might see when your furnace refuses to or keep operating. Most of these problems have to be taken care of by a professional, like one from Central Air LLC.

  1. The pair of LED lights are off. This means your heater might not have electricity. Check the breaker box to make sure the furnace fuse hasn’t flipped. You should reset the fuse if it’s in the “off” area. If it immediately turns off following a reset, leave the breaker alone and call us at 203-357-5913.
  2. An individual light is continuous and the other is flickering slowly. This means the flame rollout switch is may be not working right. The part is an essential safety tool that aids in preventing fires and carbon monoxide. You shouldn’t attempt to fix this fault without professional help.
  3. An individual light is flashing rapidly and the other is blinking slowly. This usually signifies power polarity has been transposed. Your furnace might have a wiring problem that needs expert aid from Central Air LLC.
  4. Both lights are blinking slowly. This indicates your furnace’s blower motor probably isn’t operating. This part distributes heated air from the HVAC system into your rooms. We can help in figuring out what’s wrong with this component.
  5. A single light is blinking slowly and the other is flashing rapidly. This means your heater may have not enough voltage or a short circuit. Contact our specialists at 203-357-5913 for help.
  6. One light is blinking on, on and off while the other blinks on, off, on. This indicates there might be a problem with your heater’s control panel or wiring. Central Air LLC can find the fault and repair it.
  7. The pair of lights are using alternating slow blinks. This signifies your HVAC system may have a flame error. There might be trouble with its gas supply, gas valve or ignitor control. Call us at 203-357-5913 for assistance.
  8. A single light flashes slowly while the other stays steady. This usually signifies your HVAC system’s limit switch is experiencing an error. The switch prevents your HVAC equipment from overheating. Reach out to the specialists at Central Air LLC for help.

Heating System Blower Operates But No Warm Air

Here’s what might be at fault when you notice your furnace’s blower fan working, but you aren’t receiving any heat.

  • Both lights display every other fast flashes. This means your furnace ignitor may be broken. This piece lights energy in your furnace to make warm air and should be serviced by an expert from Central Air LLC.

Trust Us for Expert Furnace Repair

When you need to get your HVAC equipment in working order without delay, trust the technicians at Central Air LLC. Our pros will repair the issue right away and have your space feeling relaxing again in no time. Contact us at 203-357-5913 or contact us online to get an appointment right away.