Furnace troubleshooting

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

While your Lennox® heating system can’t speak to you, it has a process to tell you about a furnace error.

Its control board has double LED lights that can show a fault code. Subject to the fault, your heating system might show continuous or flashing lights.

While there are various elementary heating fixes you can do without an expert, most fixes are best handled by HVAC technicians. When your furnace refuses to start or provide heated air, contact Faust Air Conditioning and Heating at 979-532-2511 for experienced furnace repair in Wharton.

Our technicians will swiftly pinpoint and take care of the fault, even if you don’t have a Lennox heating system. We can fix whichever brands or models—and get the heat reintroduced to your house without delay.


What Does the Flashing Light on My Heating System Mean?

Your heater uses lights to flash code when it isn’t working right. It also engages these lights to tell you it’s operating correctly.

Normal function consists of:

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

If you notice a single light flashing slowly and the other going on and off fast, your heating system might be experiencing a low flame signal. This can happen even when your heater is heating properly. It means the flame sensing rod might need to be cleaned or in the incorrect spot on the burner. Call us at 979-532-2511 for support.

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

Heater Refuses to Start

Here are many of the light arrangements you may notice when your heater won’t turn on or keep running. The majority of these issues have to be fixed by an expert, like one from Faust Air Conditioning and Heating.

  1. The pair of LED lights are off. This signifies your HVAC system might not have power. Check the breaker box to ensure the heater fuse hasn’t triggered. Attempt to reset the fuse if it is in the “off” spot. If it rapidly turns off following a reset, leave the breaker alone and contact us at 979-532-2511.
  2. An individual light is solid and the other is flickering slowly. This signifies the flame rollout switch is may be open. The switch is an essential safety tool that assists in stopping fires and carbon monoxide. You shouldn’t try to take care of this fault yourself.
  3. A single light is flickering quickly and the other is flickering slowly. This typically means power polarity has been reversed. Your furnace may have a wiring issue that calls for expert aid from Faust Air Conditioning and Heating.
  4. The pair of lights are flickering slowly. This indicates your heater’s blower motor likely isn’t running. This piece distributes heated air from the HVAC system into your space. We can help in pinpointing what’s wrong with this component.
  5. One light is flickering slowly and the other is flashing fast. This indicates your heater could have not enough voltage or a short circuit. Call our experts at 979-532-2511 for support.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there could be a fault with your heater’s control panel or wiring. Faust Air Conditioning and Heating can determine the error and handle it.
  7. The pair of lights display alternate slow flickers. This means your HVAC equipment possibly has a flame error. There might be an issue with its gas supply, gas valve or ignitor control. Contact us at 979-532-2511 for help.
  8. An individual light flickers slowly while the other stays solid. This often means your furnace’s limit switch is experiencing an error. The switch stops your HVAC system from becoming too warm. Contact the experts at Faust Air Conditioning and Heating for support.

Heater Blower Works But No Warm Air

Here’s what could be at fault when you notice your heating system’s blower fan working, but you aren’t receiving any warm air.

  • The pair of lights are showing alternating rapid blinks. This means your furnace ignitor could not be working. This part lights energy in your furnace to create heat and should be fixed by a specialist from Faust Air Conditioning and Heating.

Depend on Us for Expert Furnace Repair

When you need to have your heating system fixed quickly, turn to the technicians at Faust Air Conditioning and Heating. Our pros will fix the error right away and have your home feeling cozy again in no time. Call us at 979-532-2511 or contact us online to schedule an appointment right away.

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