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

December 06, 2019

While your Lennox® heater cannot speak to you, it possesses a way to get your attention when there’s a furnace error.

Its motherboard has two LED lights that can share a fault code. Depending on the fault, your heater might use continuous or flashing lights.

Though there are a few simple furnace repairs you can finish yourself, most repairs are best handled by the professionals. When your furnace refuses to turn on or put out warm air, reach out to Cool Power LLC at 631-246-4029 for skilled furnace repair in Ronkonkoma.

Our specialists will rapidly identify and take care of the issue, even if you don’t own a Lennox furnace. We can repair whichever kinds or configuration—and get the heat reintroduced to your residence without delay.


What Does the Flashing Light on My Heating System Mean?

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

Normal heating consists of:

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

If you realize that a lone light flashing slowly and the other going on and off fast, your heating system could be having a low flame signal. This can occur even when your heater is heating like it should. It signifies the flame sensing rod could be dirty or in the wrong area on the burner. Contact us at 631-246-4029 for help.

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

Heating System Won’t Kick On

Here are a few of the light arrangements you may notice when your heating system will not or stay on. Most of these errors need to be handled by a technician, like one from Cool Power LLC .

  1. Both LED lights are off. This indicates your heater might not be receiving power. Look at the breaker box to make sure the heating system fuse isn’t flipped. Try resetting the fuse if it’s in the “off” position. If it instantly turns off following a reset, don’t touch the breaker and call us at 631-246-4029.
  2. One light is stable and the other is flashing slowly. This means the flame rollout switch is likely open. The component is an essential safety device that assists in stopping fires and carbon monoxide. You shouldn’t try to take care of this malfunction on your own.
  3. One light is flashing quickly and the other is flashing slowly. This usually indicates power polarity has been reversed. Your heater might have a wiring issue that calls for specialized aid from Cool Power LLC .
  4. Both lights are blinking slowly. This indicates your heating system’s blower motor possibly isn’t working. This part circulates warm air from the heater into your rooms. We can aid in figuring out what’s wrong with this component.
  5. A single light is flickering slowly and the other is flashing rapidly. This means your heater might have not enough voltage or a short circuit. Contact our specialists at 631-246-4029 for support.
  6. One light is blinking on, on and off while the other blinks on, off, on. This indicates there may be a problem with your heating system’s motherboard or wiring. Cool Power LLC can find the fault and handle it.
  7. The pair of lights display every other slow flashes. This signifies your heating system possibly has a flame error. There may be an issue with its gas supply, gas valve or ignitor control. Call us at 631-246-4029 for help.
  8. An individual light flashes slowly while the other remains solid. This often means your heating system’s limit switch is malfunctioning. The switch stops your HVAC equipment from overheating. Call the specialists at Cool Power LLC for assistance.

Heater Blower Operates But No Heat

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

  • The duo of lights are showing alternate quick flickers. This indicates your furnace ignitor may be broken. This piece kindles fuel in your heating system to produce warmth and should be serviced by a technician from Cool Power LLC .

Trust Us for Expert Furnace Repair

When you need to get your heating system repaired quickly, trust the specialists at Cool Power LLC . Our technicians will handle the error promptly and have your rooms feeling relaxing again in no time. Reach out to us at 631-246-4029 or contact us online to request an appointment today.