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

December 06, 2019

While your Lennox® furnace cannot chat with you, it possesses a procedure to get your attention when there’s a furnace error.

Its motherboard has two LED lights that can share a fault code. Depending on the malfunction, your heating system might use steady or flashing lights.

Although there are some simple heating adjustments you can do on your own, the majority of repairs are best handled by HVAC technicians. When your furnace won’t kick on or put out warm air, get in touch with Discount Mechanical Heating & Plumbing Services at 907-202-9798 for experienced furnace repair in Anchorage.

Our experts will speedily pinpoint and take care of the problem, even if you don’t own a Lennox heating system. We can service all kinds or configuration—and get the warmth returned to your house without delay.


What Does the Flickering Light on My Heater Mean?

Your heater depends on lights to flash code when it isn’t working right. It also works these lights to tell you it’s running like it should.

Correct heating includes:

  • Simultaneous slow flash—heater heating correctly.
  • Simultaneous fast flash—heater is initiating the call for heat.

If you notice a lone light going on and off slowly and the other flashing rapidly, your heating system may have a low flame signal. This can occur even when your furnace is heating like it should. It signifies the flame sensing rod might be dirty or in the wrong location on the burner. Reach out to us at 907-202-9798 for help.

Here are a few other of the most typical errors for Lennox heating systems.

Furnace Won’t Start

Here are many of the light arrangements you may see when your heater won’t turn on or keep heating. The majority of these problems need to be handled by a professional, such as one from Discount Mechanical Heating & Plumbing Services.

  1. The pair of LED lights are extinguished. This means your HVAC system might not have electricity. Check the breaker box to ensure the heater fuse isn’t triggered. Attempt to reset the fuse if it’s in the “off” spot. If it promptly trips after a subsequent reset, don’t touch the breaker and contact us at 907-202-9798.
  2. A single light is continuous and the other is blinking slowly. This shows the flame rollout switch is likely not working right. The switch is an important safety device that assists in stopping fires and carbon monoxide. You shouldn’t try to repair this fault without professional help.
  3. A single light is flashing quickly and the other is blinking slowly. This likely means power polarity has been reversed. Your heater may have a wiring fault that calls for specialized help from Discount Mechanical Heating & Plumbing Services.
  4. All lights are blinking slowly. This signifies your heater’s blower motor probably isn’t running. This piece circulates warm air from the furnace into your residence. We can help in determining what’s causing an issue with this piece.
  5. A single light is flickering slowly and the other is flickering rapidly. This means your heater may have low voltage or a short circuit. Contact our technicians at 907-202-9798 for help.
  6. One light is blinking on, on and off while the other blinks on, off, on. This signifies there could be an error with your heater’s control panel or wiring. Discount Mechanical Heating & Plumbing Services can pinpoint the fault and fix it.
  7. The pair of lights show every other slow blinks. This indicates your HVAC system may have a flame error. There might be an issue with its gas supply, gas valve or ignitor control. Call us at 907-202-9798 for assistance.
  8. One light blinks slowly while the other stays steady. This often signifies your heating system’s limit switch is open. The switch keeps your heating system from getting too hot. Call the specialists at Discount Mechanical Heating & Plumbing Services for support.

Heating System Blower Runs But No Warmth

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

  • The pair of lights are showing alternating fast blinks. This means your furnace ignitor could not be in working order. This component ignites fuel in your heater to produce warmth and should be serviced by a professional from Discount Mechanical Heating & Plumbing Services.

Depend on Us for Professional Furnace Repair

When you need to get your heater repaired without delay, turn to the technicians at Discount Mechanical Heating & Plumbing Services. Our pros will take care of the issue quickly and have your home feeling comfortable again in no time. Reach out to us at 907-202-9798 or contact us online to get an appointment right away.