Furnace troubleshooting

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

While your Lennox® heating system cannot talk to you, it possesses a way to get your attention when there’s a furnace error.

Its control panel has two LED lights that can show a fault code. Subject to the issue, your furnace might use steady or flashing lights.

While there are certain elementary heating repairs you can take care of on your own, the majority of services are best handled by the professionals. When your heater will not kick on or deliver heat, contact Rapids Sheet Metal Works Inc at 715-301-0256 for experienced furnace repair in Wisconsin Rapids.

Our experts will speedily identify and take care of the failure, even if you don’t have a Lennox heater. We can repair any kinds or configuration—and get the warmth restored to your home without delay.


What Does the Flashing Light on My Furnace Mean?

Your heating system depends on lights to flash code when it is malfunctioning. It also works these lights to tell you it’s heating like it should.

Normal operation consists of:

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

If you notice a lone light going on and off slowly and the other blinking rapidly, your heating system may be experiencing a low flame signal. This can take place even when your heater is working properly. It signifies the flame sensing rod may have build-up or in the bad spot on the burner. Call us at 715-301-0256 for help.

Here are several other of the most common errors for Lennox HVAC systems.

Heater Won’t Kick On

Here are some of the light sequences you could observe when your heater won’t turn on or stay on. The majority of these problems have to be taken care of by a professional, for instance from Rapids Sheet Metal Works Inc.

  1. The pair of LED lights are extinguished. This signifies your HVAC system might not have power. Find the breaker box to ensure the heater fuse isn’t flipped. Attempt to reset the fuse if it’s in the “off” spot. If it immediately turns off after you reset it, don’t try to reset it again and contact us at 715-301-0256.
  2. One light is stable and the other is flashing slowly. This signifies the flame rollout switch is probably open. The switch is an important safety tool that aids in preventing fires and carbon monoxide. You shouldn’t try to take care of this malfunction without professional help.
  3. A single light is blinking fast and the other is blinking slowly. This often signifies power polarity has been inverted. Your heater may have a wiring fault that needs specialized aid from Rapids Sheet Metal Works Inc.
  4. Both lights are blinking slowly. This means your heater’s blower motor probably isn’t running. This component moves hot air from the HVAC system into your residence. We can help in figuring out what’s wrong with this component.
  5. An individual light is flashing slowly and the other is blinking fast. This indicates your HVAC system might have insufficient voltage or a short circuit. Reach out to our technicians at 715-301-0256 for assistance.
  6. One light is flashing on, on and off while the other blinks on, off, on. This indicates there might be trouble with your furnace’s control board or wiring. Rapids Sheet Metal Works Inc can locate the error and fix it.
  7. The duo of lights are using alternate slow flickers. This means your HVAC equipment may have a flame error. There could be an issue with its gas supply, gas valve or ignitor control. Contact us at 715-301-0256 for support.
  8. An individual light flashes slowly while the other is continuous. This usually means your heating system’s limit switch is not working. The switch stops your heater from overheating. Call the experts at Rapids Sheet Metal Works Inc for help.

Furnace Blower Runs But No Heat

Here’s what might be wrong when you hear your heater’s blower fan running, but you aren’t receiving any heated air.

  • The duo of lights display every other fast blinks. This indicates your furnace ignitor may not be working. This part ignites fuel in your furnace to create heat and should be fixed by a professional from Rapids Sheet Metal Works Inc.

Depend on Us for Expert Furnace Repair

When you have to get your heating system fixed quickly, turn to the technicians at Rapids Sheet Metal Works Inc. Our technicians will fix the fault right away and have your home feeling comfortable again in no time. Get in touch with us at 715-301-0256 or contact us online to schedule an appointment now.

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