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

December 06, 2019

While your Lennox® HVAC equipment cannot speak to you, it does have a way to tell you about a furnace error.

Its control panel has a set of LED lights that can show a fault code. Based on the failure, your heating system could display steady or flashing lights.

Though there are certain simple HVAC fixes you can take care of yourself, most repairs are best left to experts. When your heating system will not turn on or provide warm air, get in touch with Franklin's Heating & Air Conditioning, Inc at 662-281-1231 for experienced furnace repair in Oxford.

Our experts will speedily detect and handle the failure, even if you don’t have a Lennox furnace. We can repair all brands or models—and get the warmth reintroduced to your residence fast.


What Does the Blinking Light on My Heater Mean?

Your furnace uses lights to flash code when it is malfunctioning. It also uses these lights to let you know it’s operating correctly.

Correct operation consists of:

  • Simultaneous slow flash—heater working properly.
  • Simultaneous fast flash—heating system is starting to call for heat.

If you notice a solitary light flashing slowly and the other blinking fast, your heating system might have a low flame signal. This can happen even when your furnace is operating correctly. It signifies the flame sensing rod could be dirty or in the wrong spot on the burner. Reach out to us at 662-281-1231 for help.

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

Heating System Will Not Start

Here are a few of the light sequences you may observe when your heating system will not or keep heating. The bulk of these errors have to be repaired by a professional, for instance from Franklin's Heating & Air Conditioning, Inc.

  1. Both LED lights are extinguished. This signifies your heating system might not have electricity. Examine the breaker box to confirm the heating system fuse has not triggered. You should reset the fuse if it’s in the “off” area. If it immediately flips after a subsequent reset, don’t try to reset it again and get in touch with us us at 662-281-1231.
  2. A single light is stable and the other is flickering slowly. This means the flame rollout switch is possibly not working right. The switch is an important safety device that assists in avoiding fires and carbon monoxide. You shouldn’t seek to fix this problem yourself.
  3. One light is blinking quickly and the other is flashing slowly. This usually indicates power polarity has been reversed. Your furnace might have a wiring issue that calls for specialized help from Franklin's Heating & Air Conditioning, Inc.
  4. All lights are flashing slowly. This signifies your heating system’s blower motor possibly isn’t working. This piece moves warm air from the heater into your space. We can aid in figuring out what’s causing a problem with this part.
  5. One light is flickering slowly and the other is flashing quickly. This indicates your HVAC system could have not enough voltage or a short circuit. Reach out to our professionals at 662-281-1231 for help.
  6. One light is blinking on, on and off while the other blinks on, off, on. This signifies there may be a problem with your heating system’s control board or wiring. Franklin's Heating & Air Conditioning, Inc can locate the issue and handle it.
  7. The pair of lights are using every other slow flickers. This indicates your heater possibly has a flame problem. There may be an issue with its gas supply, gas valve or ignitor control. Contact us at 662-281-1231 for assistance.
  8. A single light blinks slowly while the other remains steady. This often signifies your heating system’s limit switch is not working. The switch prevents your heating system from getting too hot. Contact the specialists at Franklin's Heating & Air Conditioning, Inc for help.

Heater Blower Operates But No Warmth

Here’s what may be at fault when you notice your heating equipment’s blower fan on, but you aren’t receiving any heat.

  • The pair of lights are showing alternating rapid flickers. This signifies your furnace ignitor might be broken. This piece ignites energy in your heater to make warm air and should be serviced by an expert from Franklin's Heating & Air Conditioning, Inc.

Turn to Us for Skilled Furnace Repair

When you need to have your HVAC equipment in working order fast, trust the experts at Franklin's Heating & Air Conditioning, Inc. Our pros will repair the problem quickly and have your house feeling relaxing again soon. Get in touch with us at 662-281-1231 or contact us online to request an appointment today.