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

December 06, 2019

While your Lennox® HVAC equipment isn’t able to chat with you, it does have a way to get your attention when there’s a furnace error.

Its control panel has double LED lights that can display a fault code. Based on the malfunction, your heater may display steady or flashing lights.

Though there are a few simple HVAC adjustments you can complete without an expert, many tasks are best left to HVAC technicians. When your heating system refuses to kick on or provide heat, get in touch with Three Rivers Heating & Cooling at 503-213-4433 for professional furnace repair in Portland.

Our experts will rapidly spot and repair the fault, even if you don’t own a Lennox heating system. We can fix any kinds or configuration—and get the warmth restored to your home fast.


What Does the Blinking Light on My Heater Mean?

Your heater relies on lights to flash code when it requires repairs. It also uses this setup to relay it’s heating like it should.

Normal operation consists of:

  • Both lights flash slowly—heater running properly.
  • Concurrent fast flash—heater is starting to call for heat.

If you notice a single light blinking slowly and the other going on and off fast, your furnace may have a low flame signal. This can occur even when your heating system is operating correctly. It means the flame sensing rod could have build-up or in the incorrect area on the burner. Reach out to us at 503-213-4433 for assistance.

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

Heating System Will Not Start

Here are many of the light sequences you may notice when your heater won’t turn on or stay on. The bulk of these problems need to be repaired by a professional, for instance from Three Rivers Heating & Cooling.

  1. The pair of LED lights aren’t lit. This means your heating system might not be receiving power. Find the breaker box to ensure the heater fuse hasn’t triggered. You should reset the fuse if it has moved into the “off” position. If it rapidly flips after you reset it, leave the breaker alone and get in touch with us us at 503-213-4433.
  2. A single light is continuous and the other is flashing slowly. This shows the flame rollout switch is probably not working right. The part is an essential safety mechanism that assists in avoiding fires and carbon monoxide. You shouldn’t seek to fix this malfunction without professional help.
  3. A single light is blinking rapidly and the other is flashing slowly. This usually indicates power polarity has been inverted. Your heater may have a wiring fault that needs expert support from Three Rivers Heating & Cooling.
  4. The pair of lights are flickering slowly. This means your heating system’s blower motor likely isn’t running. This component sends heated air from the furnace into your house. We can help in pinpointing what’s causing a problem with this piece.
  5. A single light is flashing slowly and the other is blinking rapidly. This means your HVAC system could have insufficient voltage or a short circuit. Get in touch with our professionals at 503-213-4433 for support.
  6. One light is flashing on, on and off while the other blinks on, off, on. This indicates there could be a problem with your heating system’s control panel or wiring. Three Rivers Heating & Cooling can pinpoint the problem and handle it.
  7. The pair of lights are using alternate slow blinks. This indicates your heating system may have a flame error. There could be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 503-213-4433 for help.
  8. An individual light flickers slowly while the other is steady. This usually signifies your HVAC system’s limit switch is experiencing an error. The switch prevents your heater from overheating. Reach out to the pros at Three Rivers Heating & Cooling for assistance.

Heater Blower Works But No Warmth

Here’s what may be broken when you notice your heating equipment’s blower fan on, but you aren’t getting any warm air.

  • The duo of lights are showing every other quick blinks. This indicates your furnace ignitor could not be in working order. This piece kindles gas in your heater to create heat and should be fixed by a professional from Three Rivers Heating & Cooling.

Trust Us for Professional Furnace Repair

When you have to have your furnace in working order quickly, depend on the technicians at Three Rivers Heating & Cooling. Our technicians will take care of the fault quickly and have your home feeling comfortable again in no time. Reach out to us at 503-213-4433 or contact us online to request an appointment right away.