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 control panel has a set of LED lights that can share a fault code. Subject to the failure, your heater could use continuous or flashing lights.

Though there are a few simple heating adjustments you can complete on your own, the majority of services are best handled by HVAC technicians. When your heater will not start or deliver heated air, call KDM Service Corporation at 205-208-8090 for skilled furnace repair in Tuscaloosa.

Our experts will swiftly pinpoint and handle the breakdown, even if you don’t use a Lennox heating system. We can service any kinds or models—and get the heat restored to your residence without delay.


What Does the Blinking Light on My Heater Mean?

Your furnace relies on lights to flash code when it is malfunctioning. It also engages this system to let you know it’s working correctly.

Regular operation consists of:

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

If you notice one light blinking slowly and the other blinking rapidly, your heating system could be experiencing a low flame signal. This can occur even when your heating system is working properly. It indicates the flame sensing rod could have build-up or in the incorrect location on the burner. Call us at 205-208-8090 for support.

Here are several other of the most typical problems for Lennox HVAC systems.

Furnace Will Not Start

Here are a few of the light arrangements you could see when your heater refuses to or keep operating. The bulk of these issues need to be fixed by an expert, like one from KDM Service Corporation.

  1. The pair of LED lights are extinguished. This means your heating system might not be receiving power. Go to the breaker box to confirm the furnace fuse hasn’t triggered. Attempt to reset the fuse if it is in the “off” position. If it rapidly flips after a subsequent reset, don’t touch the breaker 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 component is an important safety mechanism that helps in preventing fires and carbon monoxide. You shouldn’t attempt to fix this malfunction yourself.
  3. A single light is flickering rapidly and the other is flickering slowly. This often signifies power polarity has been inverted. Your heating system could have a wiring fault that needs specialized support from KDM Service Corporation.
  4. All lights are blinking slowly. This indicates your heater’s blower motor possibly isn’t working. This piece sends hot air from the heater into your house. We can assist 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 could have insufficient voltage or a short circuit. Call our specialists at 205-208-8090 for support.
  6. One light is flickering on, on and off while the other flashes on, off, on. This signifies there might be an error with your furnace’s control board or wiring. KDM Service Corporation can determine the issue and fix it.
  7. The pair of lights are using alternate slow flickers. This signifies your heater may have a flame issue. There may be an issue with its gas supply, gas valve or ignitor control. Call us at 205-208-8090 for assistance.
  8. One light flickers slowly while the other stays steady. This usually signifies your heating system’s limit switch is malfunctioning. The switch prevents your HVAC system from overheating. Get in touch with the pros at KDM Service Corporation for help.

Furnace Blower Operates But No Warm Air

Here’s what could be at fault when you notice your heating system’s blower fan running, but you aren’t getting any warmth.

  • The duo of lights are giving every other quick blinks. This signifies your furnace ignitor may be broken. This part lights energy in your heating system to make warmth and should be serviced by an expert from KDM Service Corporation.

Trust Us for Professional Furnace Repair

When you have to get your HVAC equipment repaired without delay, depend on the professionals at KDM Service Corporation. Our techs will repair the error without delay and have your residence feeling relaxing again in no time. Contact us at 205-208-8090 or contact us online to request an appointment today.

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