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 communicate a furnace error.

Its motherboard has double LED lights that can show a fault code. Depending on the issue, your furnace might show solid or flashing lights.

While there are a few elementary heating repairs you can complete without an expert, many services are best handled by experts. When your furnace refuses to kick on or provide warmth, reach out to Tri City Fuel & Heating Co., Inc. at 803-265-4208 for professional furnace repair in West Columbia.

Our experts will rapidly identify and handle the breakdown, even if you don’t have a Lennox furnace. We can fix any brands or makes—and get the warmth restored to your home without delay.


What Does the Blinking Light on My Heater Mean?

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

Regular heating involves:

  • Concurrent slow flash—heater heating correctly.
  • Simultaneous fast flash—furnace is beginning to call for heat.

If you see one light blinking slowly and the other blinking quickly, your heater may be having a low flame signal. This can occur even when your heating system is operating properly. It signifies the flame sensing rod may be dirty or in the wrong area on the burner. Reach out to us at 803-265-4208 for assistance.

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 could notice when your furnace refuses to or keep heating. The majority of these errors must be fixed by an expert, such as one from Tri City Fuel & Heating Co., Inc..

  1. The pair of LED lights aren’t lit. This signifies your HVAC system might not have electricity. Look at the breaker box to make sure the heater fuse is not tripped. Attempt to reset the fuse if it’s in the “off” area. If it immediately flips after a subsequent reset, leave the breaker alone and contact us at 803-265-4208.
  2. An individual 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 aids in avoiding fires and carbon monoxide. You shouldn’t try to repair this malfunction on your own.
  3. A single light is flashing quickly and the other is flickering slowly. This likely signifies power polarity has been transposed. Your furnace might have a wiring error that calls for expert support from Tri City Fuel & Heating Co., Inc..
  4. The duo of lights are blinking slowly. This signifies your heating system’s blower motor likely isn’t working. This part circulates hot air from the HVAC system into your home. We can help in determining what’s causing a problem with this piece.
  5. A single light is flashing slowly and the other is flickering quickly. This indicates your heater could have low voltage or a short circuit. Reach out to our professionals at 803-265-4208 for assistance.
  6. One light is blinking on, on and off while the other blinks 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 find the error and take care of it.
  7. The pair of lights are using every other slow blinks. This indicates your HVAC system possibly has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 803-265-4208 for assistance.
  8. One light flashes slowly while the other remains continuous. This usually indicates your HVAC system’s limit switch is malfunctioning. The switch stops 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 may be broken when you hear your heating system’s blower fan running, but you aren’t getting any warmth.

  • The pair of lights display alternating quick flickers. This indicates your furnace ignitor might not be in working order. This part kindles gas in your heater to make heat and should be serviced by a technician from Tri City Fuel & Heating Co., Inc..

Trust Us for Skilled Furnace Repair

When you need to get your furnace repaired quickly, trust 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 right away.

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