Furnace troubleshooting

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

While your Lennox® heater 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 issue, your heating system could show solid or flashing lights.

Though there are certain basic furnace repairs you can take care of yourself, most fixes are best left to the professionals. When your heating system will not turn on or give warmth, get in touch with Banister's Heating & Air Conditioning Services at 575-446-3948 for expert furnace repair in Carlsbad.

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


What Does the Flashing Light on My Heating System Mean?

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

Regular heating consists of:

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

If you realize that a single light flashing slowly and the other going on and off quickly, your furnace may be experiencing a low flame signal. This can happen even when your heating system is heating properly. It signifies the flame sensing rod might need to be cleaned or in the incorrect location on the burner. Contact us at 575-446-3948 for assistance.

Here are a few other of the most routine issues for Lennox heating systems.

Heater Won’t Start

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

  1. Both LED lights aren’t lit. This indicates your heating system might not be receiving power. Check the breaker box to confirm the heating system fuse is not flipped. Try resetting the fuse if it has moved into the “off” spot. If it immediately turns off after a subsequent reset, don’t try to reset it again and get in touch with us us at 575-446-3948.
  2. One light is stable and the other is blinking slowly. This shows the flame rollout switch is may be not working right. The component is a critical safety device that helps in stopping fires and carbon monoxide. You shouldn’t seek to fix this issue yourself.
  3. A single light is flashing rapidly and the other is flickering slowly. This often signifies power polarity has been reversed. Your furnace may have a wiring issue that needs professional help from Banister's Heating & Air Conditioning Services.
  4. The duo of lights are flickering slowly. This means your heating system’s blower motor likely isn’t running. This piece distributes heated air from the heater into your space. We can aid in pinpointing what’s wrong with this component.
  5. One light is flashing slowly and the other is flashing fast. This signifies your heater may have insufficient 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 blinks on, off, on. This means there might be a malfunction with your HVAC system’s control panel or wiring. Banister's Heating & Air Conditioning Services can find the fault and repair it.
  7. The duo of lights display alternate slow flickers. This signifies your furnace likely has a flame issue. There might be trouble with its gas supply, gas valve or ignitor control. Call us at 575-446-3948 for support.
  8. A single light flickers slowly while the other stays solid. This usually indicates your HVAC equipment’s limit switch is not working. The switch keeps your HVAC equipment from getting too hot. Reach out to the professionals at Banister's Heating & Air Conditioning Services for assistance.

Heating System Blower Operates But No Warm Air

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

  • The pair of lights are giving every other fast flickers. This indicates your furnace ignitor might not be in working order. This piece ignites gas in your heating system to create 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 in working order fast, depend on 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 right away.

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