Furnace troubleshooting

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

While your Lennox® HVAC equipment isn’t able to talk to you, it has a method to tell you about a furnace error.

Its motherboard has a set of LED lights that can display a fault code. Depending on the problem, your heater could display continuous or flashing lights.

Though there are some elementary HVAC adjustments you can do on your own, most services are best taken care of by experts. When your heating system won’t turn on or give heated air, contact Ilten's Incorporated at 319-208-3295 for experienced furnace repair in Cedar Rapids.

Our experts will quickly detect and take care of the issue, even if you don’t have a Lennox heating system. We can fix any brands or makes—and get the comfort reintroduced to your house without delay.


What Does the Flickering Light on My Heater Mean?

Your heater depends on lights to flash code when it is malfunctioning. It also uses these lights to tell you it’s working correctly.

Regular operation involves:

  • Concurrent slow flash—heating system running like it should.
  • Concurrent fast flash—heater is beginning to call for heat.

If you see a single light blinking slowly and the other flashing rapidly, your heating system might have a low flame signal. This can happen even when your heating system is working correctly. It indicates the flame sensing rod could need to be cleaned or in the incorrect area on the burner. Call us at 319-208-3295 for help.

Here are several other of the most typical faults for Lennox heaters.

Heater Refuses to Kick On

Here are many of the light patterns you might observe when your heater refuses to or stay on. The majority of these issues need to be fixed by a specialist, for instance from Ilten's Incorporated.

  1. Both LED lights are off. This indicates your heating system might not have electricity. Find the breaker box to make sure the heater fuse has not triggered. Attempt to reset the fuse if it has moved into the “off” position. If it promptly turns off after a subsequent reset, don’t touch the breaker and contact us at 319-208-3295.
  2. One light is unchanging and the other is blinking slowly. This implies the flame rollout switch is possibly not working right. The part is a critical safety tool that helps in avoiding fires and carbon monoxide. You shouldn’t seek to handle this malfunction on your own.
  3. An individual light is flashing fast and the other is flashing slowly. This likely signifies power polarity has been transposed. Your heating system might have a wiring fault that needs professional aid from Ilten's Incorporated.
  4. Both lights are flashing slowly. This means your heating system’s blower motor probably isn’t running. This piece moves heated air from the HVAC system into your house. We can help in determining what’s causing a problem with this piece.
  5. An individual light is flickering slowly and the other is flickering fast. This means your heater may have insufficient voltage or a short circuit. Call our technicians at 319-208-3295 for assistance.
  6. One light is blinking on, on and off while the other flickers on, off, on. This means there might be trouble with your heating system’s control panel or wiring. Ilten's Incorporated can locate the problem and repair it.
  7. Both lights show every other slow flashes. This signifies your HVAC system possibly has a flame failure. There might be a problem with its gas supply, gas valve or ignitor control. Contact us at 319-208-3295 for support.
  8. A single light flashes slowly while the other is continuous. This usually signifies your furnace’s limit switch is malfunctioning. The switch stops your heater from becoming too warm. Get in touch with the pros at Ilten's Incorporated for assistance.

Heater Blower Runs But No Warmth

Here’s what might be at fault when you notice your furnace’s blower fan on, but you aren’t gaining any heated air.

  • Both lights are showing alternate quick flickers. This signifies your furnace ignitor could be broken. This part lights energy in your furnace to make heat and should be serviced by a technician from Ilten's Incorporated.

Trust Us for Professional Furnace Repair

When you need to get your heating system repaired quickly, depend on the experts at Ilten's Incorporated. Our pros will fix the problem quickly and have your house feeling cozy again in no time. Get in touch with us at 319-208-3295 or contact us online to schedule an appointment today.

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