Furnace troubleshooting

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

While your Lennox® heating system can’t chat with you, it does have a procedure to get your attention when there’s a furnace error.

Its control board has double LED lights that can share a fault code. Depending on the malfunction, your heater might use solid or flashing lights.

Though there are a few simple heating repairs you can complete without an expert, the majority of services are best left to the professionals. When your furnace refuses to start or deliver warmth, call Central Air Inc at 503-389-5307 for skilled furnace repair in Clackamas.

Our specialists will quickly detect and fix the fault, even if you don’t have a Lennox heating system. We can repair any kinds or makes—and get the heat returned to your home without delay.


What Does the Blinking Light on My Furnace Mean?

Your furnace relies on lights to flash code when it requires repairs. It also engages this setup to let you know it’s operating correctly.

Regular heating involves:

  • Simultaneous slow flash—heating system heating correctly.
  • Both lights flash fast—heater is starting to call for heat.

If you see a solitary light going on and off slowly and the other going on and off quickly, your heater could be experiencing a low flame signal. This can occur even when your heater is heating correctly. It signifies the flame sensing rod could have build-up or in the incorrect location on the burner. Reach out to us at 503-389-5307 for assistance.

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

Heater Won’t Kick On

Here are some of the light sequences you may notice when your heater refuses to or keep running. The bulk of these errors need to be fixed by a technician, like one from Central Air Inc.

  1. All LED lights aren’t lit. This means your heater might not be receiving power. Look at the breaker box to ensure the heating system fuse hasn’t tripped. Try resetting the fuse if it has moved into the “off” area. If it immediately trips after you reset it, don’t try to reset it again and contact us at 503-389-5307.
  2. A single light is solid and the other is blinking slowly. This signifies the flame rollout switch is may be not working right. The part is a critical safety mechanism that helps in avoiding fires and carbon monoxide. You shouldn’t try to fix this problem on your own.
  3. A single light is flickering quickly and the other is flickering slowly. This often indicates power polarity has been inverted. Your heater may have a wiring error that needs specialized help from Central Air Inc.
  4. Both lights are flashing slowly. This means your furnace’s blower motor likely isn’t running. This piece distributes warm air from the heater into your house. We can assist in figuring out what’s causing a problem with this piece.
  5. A single light is flashing slowly and the other is flashing fast. This signifies your HVAC system might have low voltage or a short circuit. Contact our experts at 503-389-5307 for support.
  6. One light is flashing on, on and off while the other flashes on, off, on. This means there may be a malfunction with your heating system’s control panel or wiring. Central Air Inc can pinpoint the error and handle it.
  7. Both lights display alternate slow flashes. This means your HVAC system may have a flame problem. There could be a problem with its gas supply, gas valve or ignitor control. Reach out to us at 503-389-5307 for support.
  8. An individual light flickers slowly while the other remains steady. This often means your HVAC equipment’s limit switch is experiencing an error. The switch prevents your heater from becoming too warm. Contact the professionals at Central Air Inc for support.

Heater Blower Works But No Warm Air

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

  • The duo of lights are showing every other fast flickers. This means your furnace ignitor could not be in working order. This component kindles energy in your heating system to make warm air and should be fixed by a professional from Central Air Inc.

Depend on Us for Professional Furnace Repair

When you need to have your heater fixed quickly, turn to the experts at Central Air Inc. Our techs will handle the issue right away and have your rooms feeling relaxing again soon. Call us at 503-389-5307 or contact us online to get an appointment now.

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