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

December 06, 2019

While your Lennox® heater cannot speak to you, it possesses a method to tell you about a furnace error.

Its control board has twin LED lights that can show a fault code. Based on the problem, your heating system may show steady or flashing lights.

Though there are certain elementary HVAC repairs you can take care of on your own, the majority of fixes are best left to HVAC technicians. When your furnace refuses to kick on or provide heated air, contact Olde Towne Heating & Air at 843-485-0967 for experienced furnace repair in Mount Pleasant.

Our experts will speedily pinpoint and fix the failure, even if you don’t own a Lennox heating system. We can service all kinds or configuration—and get the comfort returned to your residence quickly.


What Does the Flashing Light on My Heater Mean?

Your heater depends on lights to flash code when it needs to be repaired. It also engages this system to tell you it’s working like it should.

Normal heating involves:

  • Both lights flash slowly—heating system operating correctly.
  • Both lights flash fast—heater is starting to call for heat.

If you notice a single light going on and off slowly and the other going on and off fast, your furnace might be having a low flame signal. This can take place even when your furnace is operating correctly. It means the flame sensing rod may have build-up or in the incorrect spot on the burner. Call us at 843-485-0967 for help.

Here are several other of the most typical issues for Lennox HVAC systems.

Heating System Will Not Turn On

Here are many of the light arrangements you could see when your furnace won’t turn on or keep running. The bulk of these problems must be repaired by an expert, like one from Olde Towne Heating & Air.

  1. The pair of LED lights are off. This means your furnace might not have power. Look at the breaker box to confirm the heating system fuse isn’t tripped. You should reset the fuse if it’s in the “off” spot. If it rapidly flips following a reset, don’t touch the breaker and get in touch with us us at 843-485-0967.
  2. An individual light is solid and the other is flashing slowly. This means the flame rollout switch is likely malfunctioning. The component is a critical safety tool that aids in stopping fires and carbon monoxide. You shouldn’t try to handle this fault on your own.
  3. An individual light is flickering fast and the other is blinking slowly. This usually indicates power polarity has been inverted. Your heater could have a wiring error that needs specialized support from Olde Towne Heating & Air.
  4. The pair of lights are flashing slowly. This means your heating system’s blower motor probably isn’t running. This part circulates warm air from the heating system into your home. We can aid in figuring out what’s causing a problem with this component.
  5. A single light is flashing slowly and the other is flickering fast. This signifies your HVAC system could have not enough voltage or a short circuit. Reach out to our professionals at 843-485-0967 for assistance.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there might be a malfunction with your HVAC system’s control panel or wiring. Olde Towne Heating & Air can determine the error and take care of it.
  7. The pair of lights are using alternate slow flickers. This means your furnace may have a flame failure. There could be a problem with its gas supply, gas valve or ignitor control. Contact us at 843-485-0967 for support.
  8. A single light blinks slowly while the other is continuous. This usually means your heating system’s limit switch is not working. The switch stops your HVAC system from becoming too warm. Get in touch with the pros at Olde Towne Heating & Air for help.

Furnace Blower Operates But No Warm Air

Here’s what may be at fault when you observe your heating equipment’s blower fan running, but you aren’t getting any heated air.

  • The duo of lights are showing every other rapid flickers. This signifies your furnace ignitor could not be working. This component kindles gas in your heating system to make heat and should be serviced by a technician from Olde Towne Heating & Air.

Trust Us for Skilled Furnace Repair

When you need to get your furnace fixed without delay, trust the technicians at Olde Towne Heating & Air. Our pros will repair the error right away and have your space feeling relaxing again in no time. Get in touch with us at 843-485-0967 or contact us online to request an appointment today.