Furnace troubleshooting

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

While your Lennox® furnace isn’t able to chat with you, it possesses a procedure to communicate a furnace error.

Its control board has two LED lights that can show a fault code. Depending on the issue, your furnace might display continuous or flashing lights.

Though there are some basic HVAC fixes you can finish yourself, many tasks are best handled by experts. When your furnace won’t start or provide warmth, call Thurston Heating & Air Conditioning at 308-624-3485 for professional furnace repair in Kearney.

Our technicians will swiftly discover and fix the fault, even if you don’t use a Lennox heater. We can service any kinds or makes—and get the warmth reintroduced to your residence without delay.


What Does the Flashing Light on My Furnace Mean?

Your heating system relies on lights to flash code when it isn’t working right. It also works this setup to tell you it’s running like it should.

Regular function involves:

  • Concurrent slow flash—heating system operating like it should.
  • Concurrent fast flash—heater is initiating the call for heat.

If you notice a single light going on and off slowly and the other flashing fast, your furnace could have a low flame signal. This can take place even when your heater is heating properly. It indicates the flame sensing rod might have build-up or in the bad location on the burner. Contact us at 308-624-3485 for assistance.

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

Heating System Refuses to Turn On

Here are some of the light sequences you could observe when your furnace won’t turn on or stay on. Most of these issues have to be repaired by an expert, for instance from Thurston Heating & Air Conditioning.

  1. All LED lights are off. This signifies your heater might not be receiving power. Look at the breaker box to ensure the furnace fuse has not tripped. Try resetting the fuse if it’s in the “off” position. If it rapidly flips following a reset, don’t try to reset it again and contact us at 308-624-3485.
  2. An individual light is solid and the other is blinking slowly. This means the flame rollout switch is likely not working right. The component is a critical safety device that assists in avoiding fires and carbon monoxide. You shouldn’t try to take care of this problem without professional help.
  3. One light is blinking rapidly and the other is flashing slowly. This typically signifies power polarity has been inverted. Your furnace could have a wiring error that needs specialized assistance from Thurston Heating & Air Conditioning.
  4. Both lights are flickering slowly. This means your heater’s blower motor likely isn’t running. This part moves warm air from the HVAC system into your residence. We can assist in pinpointing what’s wrong with this component.
  5. A single light is flashing slowly and the other is flashing rapidly. This means your heating system might have not enough voltage or a short circuit. Reach out to our specialists at 308-624-3485 for assistance.
  6. One light is blinking on, on and off while the other flickers on, off, on. This signifies there could be trouble with your HVAC system’s control board or wiring. Thurston Heating & Air Conditioning can pinpoint the fault and repair it.
  7. The duo of lights display every other slow blinks. This signifies your heater likely has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Reach out to us at 308-624-3485 for assistance.
  8. A single light flashes slowly while the other stays solid. This often indicates your HVAC system’s limit switch is not working. The switch stops your heating system from getting too hot. Reach out to the experts at Thurston Heating & Air Conditioning for assistance.

Heater Blower Runs But No Heat

Here’s what might be wrong when you hear your furnace’s blower fan on, but you aren’t gaining any warmth.

  • The duo of lights display alternating fast flashes. This means your furnace ignitor might not be in working order. This piece kindles gas in your HVAC equipment to create warmth and should be repaired by a specialist from Thurston Heating & Air Conditioning.

Trust Us for Professional Furnace Repair

When you need to get your heating system in working order without delay, trust the professionals at Thurston Heating & Air Conditioning. Our technicians will take care of the fault without delay and have your residence feeling relaxing again in a short time. Get in touch with us at 308-624-3485 or contact us online to request an appointment right away.

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