Furnace troubleshooting

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

While your Lennox® heater can’t talk to you, it possesses a way to tell you about a furnace error.

Its motherboard has a set of LED lights that can share a fault code. Based on the issue, your heating system might use continuous or flashing lights.

Although there are a few simple heating fixes you can complete without an expert, the majority of tasks are best left to HVAC technicians. When your heating system refuses to kick on or deliver heat, call KDM Service Corporation at 205-208-8090 for skilled furnace repair in Tuscaloosa.

Our experts will swiftly diagnose and handle the problem, even if you don’t use a Lennox heating system. We can service any kinds or makes—and get the heat restored to your house quickly.


What Does the Blinking Light on My Heater Mean?

Your furnace depends on lights to flash code when it is malfunctioning. It also uses this setup to let you know it’s working correctly.

Correct operation consists of:

  • Both lights flash slowly—heater heating like it should.
  • Simultaneous fast flash—furnace is starting to call for heat.

If you realize that a solitary light going on and off slowly and the other going on and off rapidly, your heating system might have a low flame signal. This can take place even when your heating system is operating like it should. It signifies the flame sensing rod may need to be cleaned or in the wrong location on the burner. Call us at 205-208-8090 for support.

Here are some of the most routine problems for Lennox HVAC systems.

Furnace Will Not Kick On

Here are many of the light arrangements you could see when your heater will not or keep operating. The bulk of these issues must be fixed by an expert, like one from KDM Service Corporation.

  1. The pair of LED lights aren’t lit. This signifies your heating system might not have electricity. Go to the breaker box to ensure the furnace fuse hasn’t flipped. Try resetting the fuse if it is in the “off” position. If it rapidly flips after a subsequent reset, don’t try to reset it again and call us at 205-208-8090.
  2. One light is stable and the other is flashing slowly. This implies the flame rollout switch is may be not working right. The part is an important safety mechanism that helps in preventing fires and carbon monoxide. You shouldn’t try to take care of this malfunction yourself.
  3. An individual light is flickering rapidly and the other is blinking slowly. This often signifies power polarity has been inverted. Your heater could have a wiring fault that calls for specialized support from KDM Service Corporation.
  4. All lights are blinking slowly. This signifies your heater’s blower motor possibly isn’t working. This piece sends heated air from the heater into your house. We can aid in pinpointing what’s causing a problem with this component.
  5. A single light is flickering slowly and the other is flickering quickly. This means your heating system might have not enough voltage or a short circuit. Reach out to our specialists at 205-208-8090 for assistance.
  6. One light is blinking on, on and off while the other flashes on, off, on. This indicates there could be an error with your HVAC system’s control board or wiring. KDM Service Corporation can determine the issue and fix it.
  7. The duo of lights are using every other slow blinks. This signifies your heating system may have a flame issue. There might be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 205-208-8090 for assistance.
  8. One light flickers slowly while the other stays solid. This usually signifies your heating system’s limit switch is open. The switch prevents your HVAC system from getting too hot. Contact the pros at KDM Service Corporation for support.

Furnace Blower Operates But No Warmth

Here’s what could be broken when you hear your heating system’s blower fan running, but you aren’t receiving any warmth.

  • The pair of lights are showing alternate rapid flickers. This signifies your furnace ignitor may not be working. This part kindles energy in your heating system to create warmth and should be serviced by a professional from KDM Service Corporation.

Trust Us for Professional Furnace Repair

When you have to get your HVAC equipment repaired fast, trust the specialists at KDM Service Corporation. Our techs will repair the problem without delay and have your house feeling cozy again in no time. Contact us at 205-208-8090 or contact us online to request an appointment today.

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