Furnace troubleshooting

Top Lennox® Furnace Error Codes (and What They Mean)

While your Lennox® HVAC equipment can’t talk to you, it does have a process to communicate a furnace error.

Its control board has a set of LED lights that can display a fault code. Depending on the failure, your heating system might show solid or flashing lights.

Although there are certain basic furnace repairs you can take care of yourself, the majority of fixes are best left to the professionals. When your heating system refuses to turn on or give warmth, get in touch with Banister's Heating & Air Conditioning Services at 575-446-3948 for experienced furnace repair in Carlsbad.

Our technicians will speedily detect and take care of the breakdown, even if you don’t own a Lennox heating system. We can fix all types or models—and get the heat restored to your house fast.


What Does the Flickering Light on My Heating System Mean?

Your heater depends on lights to flash code when it requires repairs. It also uses these lights to let you know it’s heating correctly.

Correct function consists of:

  • Concurrent slow flash—heater operating like it should.
  • Both lights flash fast—furnace is beginning to call for heat.

If you notice a single light flashing slowly and the other blinking quickly, your furnace may have a low flame signal. This can happen even when your heater is heating like it should. It signifies the flame sensing rod might have build-up or in the wrong location on the burner. Contact us at 575-446-3948 for assistance.

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

Heating System Won’t Kick On

Here are many of the light arrangements you could observe when your heat refuses to or keep heating. Most of these problems must be repaired by a specialist, for instance from Banister's Heating & Air Conditioning Services.

  1. Both LED lights aren’t lit. This indicates your furnace might not have electricity. Find the breaker box to confirm the heater fuse is not triggered. Try resetting the fuse if it has moved into the “off” area. If it promptly flips after a subsequent reset, don’t touch the breaker and get in touch with us us at 575-446-3948.
  2. One light is stable and the other is flickering slowly. This means the flame rollout switch is may be malfunctioning. The part is an essential safety device that helps in stopping fires and carbon monoxide. You shouldn’t seek to take care of this issue yourself.
  3. An individual light is flashing fast and the other is blinking slowly. This often signifies power polarity has been reversed. Your furnace may have a wiring issue that needs professional support from Banister's Heating & Air Conditioning Services.
  4. The duo of lights are blinking slowly. This means your heater’s blower motor likely isn’t operating. This piece distributes heated air from the furnace into your space. We can assist in figuring out what’s wrong with this component.
  5. One light is flashing slowly and the other is flashing fast. This signifies your furnace may have not enough voltage or a short circuit. Contact our specialists at 575-446-3948 for help.
  6. One light is flashing on, on and off while the other flickers on, off, on. This means there could be a malfunction with your HVAC system’s motherboard or wiring. Banister's Heating & Air Conditioning Services can pinpoint the issue and take care of it.
  7. The pair of lights display every other slow blinks. This indicates your furnace likely has a flame failure. There might be an issue with its gas supply, gas valve or ignitor control. Call us at 575-446-3948 for assistance.
  8. An individual light blinks slowly while the other remains steady. This usually indicates your HVAC equipment’s limit switch is not working. The switch stops your HVAC equipment from overheating. Reach out to the experts at Banister's Heating & Air Conditioning Services for assistance.

Heating System Blower Works But No Warm Air

Here’s what may be broken when you notice your heating equipment’s blower fan on, but you aren’t gaining any warm air.

  • The duo of lights are showing alternate fast blinks. This indicates your furnace ignitor might not be in working order. This component ignites gas in your furnace to make warmth and should be fixed by a technician from Banister's Heating & Air Conditioning Services.

Trust Us for Professional Furnace Repair

When you need to get your HVAC equipment repaired fast, trust the specialists at Banister's Heating & Air Conditioning Services. Our techs will handle the error right away and have your house feeling comfortable again in no time. Contact us at 575-446-3948 or contact us online to schedule an appointment now.

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