Furnace troubleshooting

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

While your Lennox® HVAC equipment isn’t able to speak to you, it has a process to get your attention when there’s a furnace error.

Its control board has double LED lights that can share a fault code. Based on the malfunction, your furnace could use solid or flashing lights.

Although there are various basic furnace repairs you can take care of without an expert, many fixes are best left to the professionals. When your heating system refuses to turn on or put out heated air, call All Weather Heating & Air Conditioning Inc at 256-801-4701 for experienced furnace repair in Huntsville.

Our experts will speedily detect and take care of the issue, even if you don’t use a Lennox furnace. We can service whichever brands or configuration—and get the heat reintroduced to your residence fast.


What Does the Blinking Light on My Furnace Mean?

Your heater relies on lights to flash code when it requires repairs. It also uses these lights to relay it’s operating correctly.

Normal function involves:

  • Both lights flash slowly—heating system operating correctly.
  • Concurrent fast flash—heater is initiating the call for heat.

If you realize that a solitary light flashing slowly and the other blinking fast, your heater might be having a low flame signal. This can take place even when your furnace is running correctly. It signifies the flame sensing rod might have build-up or in the incorrect spot on the burner. Call us at 256-801-4701 for assistance.

Here are some of the most typical problems for Lennox heaters.

Heater Refuses to Start

Here are a few of the light arrangements you may notice when your heating system refuses to or keep heating. The bulk of these problems have to be fixed by a specialist, such as one from All Weather Heating & Air Conditioning Inc.

  1. The pair of LED lights aren’t lit. This indicates your furnace might not be receiving power. Check the breaker box to make sure the heating system fuse is not flipped. Try resetting the fuse if it’s in the “off” position. If it immediately flips after a subsequent reset, don’t touch the breaker and call us at 256-801-4701.
  2. A single light is stable and the other is flickering slowly. This signifies the flame rollout switch is probably not working right. The part is an important safety device that assists in avoiding fires and carbon monoxide. You shouldn’t try to take care of this issue yourself.
  3. One light is blinking rapidly and the other is blinking slowly. This likely means power polarity has been inverted. Your heater could have a wiring issue that needs professional support from All Weather Heating & Air Conditioning Inc.
  4. The pair of lights are flashing slowly. This signifies your heater’s blower motor possibly isn’t operating. This part moves hot air from the heater into your residence. We can assist in pinpointing what’s causing a problem with this component.
  5. A single light is flashing slowly and the other is flickering quickly. This signifies your heating system might have insufficient voltage or a short circuit. Reach out to our technicians at 256-801-4701 for help.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there might be a problem with your furnace’s control board or wiring. All Weather Heating & Air Conditioning Inc can find the issue and fix it.
  7. The pair of lights display alternating slow flickers. This signifies your HVAC equipment likely has a flame problem. There could be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 256-801-4701 for support.
  8. An individual light flickers slowly while the other stays solid. This often means your heating system’s limit switch is open. The switch keeps your HVAC system from overheating. Call the professionals at All Weather Heating & Air Conditioning Inc for assistance.

Furnace Blower Runs But No Warmth

Here’s what could be broken when you observe your heater’s blower fan working, but you aren’t gaining any warmth.

  • Both lights display alternating fast blinks. This means your furnace ignitor might be broken. This part ignites energy in your heating system to produce warm air and should be serviced by a professional from All Weather Heating & Air Conditioning Inc.

Depend on Us for Expert Furnace Repair

When you need to have your heater repaired without delay, depend on the experts at All Weather Heating & Air Conditioning Inc. Our technicians will handle the fault quickly and have your rooms feeling comfortable again soon. Reach out to us at 256-801-4701 or contact us online to request an appointment right away.

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