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

December 06, 2019

While your Lennox® furnace isn’t able to speak to you, it possesses a procedure to tell you about a furnace error.

Its control panel has double LED lights that can show a fault code. Depending on the failure, your heater might show steady or flashing lights.

Though there are certain elementary furnace fixes you can take care of without an expert, many services are best handled by the professionals. When your heater refuses to turn on or put out warmth, reach out to H&C Heating and Cooling at 301-960-3247 for professional furnace repair in Laurel.

Our specialists will speedily diagnose and take care of the failure, even if you don’t have a Lennox heater. We can service all types or models—and get the warmth returned to your residence fast.


What Does the Blinking Light on My Heater Mean?

Your furnace uses lights to flash code when it needs to be repaired. It also works this system to tell you it’s working like it should.

Correct operation includes:

  • Simultaneous slow flash—heater heating correctly.
  • Both lights flash fast—heater is initiating the call for heat.

If you see one light flashing slowly and the other blinking fast, your heating system might have a low flame signal. This can take place even when your heating system is operating properly. It indicates the flame sensing rod may have build-up or in the bad spot on the burner. Contact us at 301-960-3247 for support.

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

Heater Refuses to Kick On

Here are some of the light sequences you could notice when your heater will not or keep heating. Most of these errors have to be handled by an expert, such as one from H&C Heating and Cooling.

  1. Both LED lights aren’t lit. This signifies your furnace might not have electricity. Check the breaker box to ensure the heating system fuse isn’t triggered. Attempt to reset the fuse if it has moved into the “off” position. If it instantly flips after a subsequent reset, don’t touch the breaker and get in touch with us us at 301-960-3247.
  2. A single light is solid and the other is flashing slowly. This means the flame rollout switch is likely open. The part is a critical safety device that helps in stopping fires and carbon monoxide. You shouldn’t seek to take care of this fault yourself.
  3. A single light is blinking rapidly and the other is flashing slowly. This often means power polarity has been inverted. Your furnace could have a wiring problem that requires expert support from H&C Heating and Cooling.
  4. The pair of lights are flickering slowly. This indicates your furnace’s blower motor probably isn’t running. This piece distributes hot air from the furnace into your house. We can assist in determining what’s causing an issue with this component.
  5. A single light is blinking slowly and the other is blinking quickly. This means your furnace might have insufficient voltage or a short circuit. Contact our specialists at 301-960-3247 for help.
  6. One light is flickering on, on and off while the other blinks on, off, on. This signifies there might be trouble with your heater’s control panel or wiring. H&C Heating and Cooling can determine the fault and repair it.
  7. The duo of lights display every other slow flickers. This signifies your heating system may have a flame failure. There may be an issue with its gas supply, gas valve or ignitor control. Call us at 301-960-3247 for help.
  8. An individual light flashes slowly while the other is continuous. This often signifies your heater’s limit switch is experiencing an error. The switch keeps your heating system from becoming too warm. Get in touch with the specialists at H&C Heating and Cooling for support.

Heating System Blower Operates But No Warm Air

Here’s what could be broken when you hear your heater’s blower fan running, but you aren’t gaining any warm air.

  • The pair of lights are showing every other quick flashes. This means your furnace ignitor could not be in working order. This part kindles energy in your heating system to make warm air and should be fixed by a specialist from H&C Heating and Cooling.

Depend on Us for Professional Furnace Repair

When you need to get your heater in working order quickly, turn to the specialists at H&C Heating and Cooling. Our technicians will take care of the fault quickly and have your home feeling cozy again soon. Reach out to us at 301-960-3247 or contact us online to schedule an appointment now.