Furnace troubleshooting

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

While your Lennox® heater cannot talk to you, it does have a method to get your attention when there’s a furnace error.

Its control panel has double LED lights that can share a fault code. Depending on the issue, your furnace might display steady or flashing lights.

While there are a few elementary heating repairs you can complete without an expert, many services are best left to HVAC technicians. When your furnace refuses to start or provide warmth, call Tri City Fuel & Heating Co., Inc. at 803-265-4208 for professional furnace repair in West Columbia.

Our specialists will rapidly discover and handle the problem, even if you don’t have a Lennox furnace. We can fix any brands or models—and get the warmth restored to your home quickly.


What Does the Blinking Light on My Heater Mean?

Your heater depends on lights to flash code when it needs to be repaired. It also works this setup to relay it’s operating correctly.

Correct function includes:

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

If you see a solitary light blinking slowly and the other blinking quickly, your heater may be having a low flame signal. This can take place even when your heater is working like it should. It indicates the flame sensing rod may be dirty or in the incorrect location on the burner. Contact us at 803-265-4208 for help.

Here are a few other of the most common problems for Lennox furnaces.

Heater Refuses to Turn On

Here are a few of the light arrangements you might notice when your furnace will not or stay on. The majority of these errors must be handled by an expert, such as one from Tri City Fuel & Heating Co., Inc..

  1. The pair of LED lights are extinguished. This signifies your HVAC system might not be receiving power. Look at the breaker box to make sure the heating system fuse is not tripped. Try resetting the fuse if it’s in the “off” area. If it immediately flips following a reset, leave the breaker alone and get in touch with us us at 803-265-4208.
  2. A single light is solid and the other is blinking slowly. This implies the flame rollout switch is may be not working right. The component is a critical safety mechanism that assists in stopping fires and carbon monoxide. You shouldn’t try to repair this problem on your own.
  3. A single light is flashing quickly and the other is flickering slowly. This likely indicates power polarity has been transposed. Your furnace might have a wiring fault that needs specialized support from Tri City Fuel & Heating Co., Inc..
  4. The duo of lights are blinking slowly. This indicates your heating system’s blower motor possibly isn’t working. This part moves hot air from the HVAC system into your rooms. We can help in determining what’s causing an issue with this piece.
  5. A single light is flashing slowly and the other is flickering quickly. This indicates your furnace could have low voltage or a short circuit. Call our professionals at 803-265-4208 for assistance.
  6. One light is flickering on, on and off while the other flickers on, off, on. This means there could be a fault with your heater’s control board or wiring. Tri City Fuel & Heating Co., Inc. can pinpoint the error and take care of it.
  7. The duo of lights are using alternate slow blinks. This indicates your HVAC system likely has a flame issue. There might be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 803-265-4208 for support.
  8. One light flashes slowly while the other remains continuous. This usually signifies your heater’s limit switch is malfunctioning. The switch keeps your HVAC equipment from getting too hot. Call the pros at Tri City Fuel & Heating Co., Inc. for assistance.

Heater Blower Runs But No Warmth

Here’s what might be broken when you hear your furnace’s blower fan running, but you aren’t getting any warmth.

  • The duo of lights display alternating rapid flickers. This signifies your furnace ignitor could not be in working order. This part lights fuel in your heater to make heat and should be serviced by a technician from Tri City Fuel & Heating Co., Inc..

Trust Us for Professional Furnace Repair

When you need to have your furnace in working order quickly, depend on the experts at Tri City Fuel & Heating Co., Inc.. Our techs will repair the fault right away and have your residence feeling relaxing again soon. Contact us at 803-265-4208 or contact us online to schedule an appointment now.

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