Furnace troubleshooting

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

While your Lennox® heater cannot talk to you, it has a process to tell you about a furnace error.

Its control board has twin LED lights that can share a fault code. Based on the issue, your furnace may use continuous or flashing lights.

While there are certain basic heating fixes you can complete on your own, most repairs are best left to the professionals. When your heater will not kick on or give warm air, call Cool Power LLC at 631-246-4029 for skilled furnace repair in Ronkonkoma.

Our experts will quickly determine and repair the issue, even if you don’t use a Lennox furnace. We can service any kinds or makes—and get the comfort restored to your residence fast.


What Does the Flickering Light on My Heater Mean?

Your heater uses lights to flash code when it needs to be repaired. It also works this setup to relay it’s working properly.

Correct operation includes:

  • Both lights flash slowly—furnace heating properly.
  • Simultaneous fast flash—furnace is starting to call for heat.

If you see a solitary light flashing slowly and the other going on and off rapidly, your furnace may have a low flame signal. This can happen even when your furnace is working properly. It indicates the flame sensing rod could have build-up or in the bad location on the burner. Contact us at 631-246-4029 for help.

Here are some of the most routine problems for Lennox heating systems.

Heating System Will Not Kick On

Here are many of the light sequences you might notice when your heating system won’t turn on or stay on. The majority of these issues must be taken care of by an expert, like one from Cool Power LLC .

  1. The pair of LED lights are extinguished. This means your HVAC system might not have electricity. Find the breaker box to ensure the heater fuse hasn’t flipped. Attempt to reset the fuse if it’s in the “off” position. If it instantly trips after a subsequent reset, don’t try to reset it again and call us at 631-246-4029.
  2. One light is solid and the other is blinking slowly. This shows the flame rollout switch is likely not working right. The part is a critical safety device that helps in preventing fires and carbon monoxide. You shouldn’t seek to repair this fault on your own.
  3. A single light is flashing quickly and the other is flickering slowly. This often means power polarity has been reversed. Your heating system might have a wiring error that requires specialized support from Cool Power LLC .
  4. The pair of lights are flickering slowly. This indicates your heater’s blower motor probably isn’t operating. This piece circulates warm air from the furnace into your home. We can aid in pinpointing what’s causing an issue with this piece.
  5. A single light is flickering slowly and the other is blinking quickly. This indicates your heating system may have not enough voltage or a short circuit. Reach out to our specialists at 631-246-4029 for assistance.
  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 HVAC system’s control panel or wiring. Cool Power LLC can determine the fault and fix it.
  7. The pair of lights are using alternate slow blinks. This indicates your HVAC equipment may have a flame problem. There might be a problem with its gas supply, gas valve or ignitor control. Contact us at 631-246-4029 for assistance.
  8. One light blinks slowly while the other is continuous. This often indicates your heater’s limit switch is not working. The switch prevents your heating system from overheating. Reach out to the professionals at Cool Power LLC for support.

Heater Blower Operates But No Warm Air

Here’s what could be wrong when you observe your furnace’s blower fan on, but you aren’t gaining any heated air.

  • The duo of lights display alternating quick flashes. This signifies your furnace ignitor may not be in working order. This part ignites gas in your furnace to produce warmth and should be fixed by a specialist from Cool Power LLC .

Turn to Us for Skilled Furnace Repair

When you have to get your HVAC equipment repaired fast, depend on the experts at Cool Power LLC . Our techs will repair the error quickly and have your home feeling relaxing again in a short time. Reach out to us at 631-246-4029 or contact us online to request an appointment today.

Back To Blog