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

December 06, 2019

While your Lennox® heating system cannot talk to you, it possesses a method to communicate a furnace error.

Its control board has two LED lights that can show a fault code. Subject to the fault, your heating system might use solid or flashing lights.

Though there are certain elementary HVAC repairs you can complete yourself, many services are best taken care of by HVAC technicians. When your heater will not start or deliver heated air, call Edington Heating & Cooling Inc at 937-558-9478 for skilled furnace repair in Troy.

Our experts will quickly pinpoint and repair the failure, even if you don’t own a Lennox heater. We can service any brands or configuration—and get the warmth restored to your residence fast.


What Does the Blinking Light on My Heating System Mean?

Your heating system depends on lights to flash code when it is malfunctioning. It also works these lights to relay it’s operating correctly.

Correct heating includes:

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

If you see one light going on and off slowly and the other going on and off fast, your furnace could be having a low flame signal. This can happen even when your furnace is operating properly. It means the flame sensing rod may be dirty or in the incorrect spot on the burner. Reach out to us at 937-558-9478 for assistance.

Here are several other of the most typical problems for Lennox furnaces.

Furnace Refuses to Turn On

Here are some of the light arrangements you might notice when your heating system will not or keep operating. Most of these problems need to be handled by a specialist, for instance from Edington Heating & Cooling Inc.

  1. All LED lights aren’t lit. This indicates your furnace might not have power. Examine the breaker box to confirm the heating system fuse is not flipped. Attempt to reset the fuse if it’s in the “off” position. If it rapidly turns off after you reset it, don’t touch the breaker and call us at 937-558-9478.
  2. A single light is unchanging and the other is blinking slowly. This implies the flame rollout switch is may be malfunctioning. The switch is an essential safety device that aids in preventing fires and carbon monoxide. You shouldn’t seek to handle this fault yourself.
  3. One light is flickering fast and the other is flickering slowly. This often means power polarity has been reversed. Your furnace could have a wiring error that needs specialized help from Edington Heating & Cooling Inc.
  4. Both lights are blinking slowly. This signifies your heater’s blower motor possibly isn’t running. This piece moves hot air from the furnace into your space. We can aid in determining what’s causing an issue with this part.
  5. A single light is flashing slowly and the other is blinking quickly. This indicates your HVAC system may have low voltage or a short circuit. Get in touch with our specialists at 937-558-9478 for support.
  6. One light is blinking on, on and off while the other flickers on, off, on. This means there might be an error with your heating system’s control board or wiring. Edington Heating & Cooling Inc can determine the fault and repair it.
  7. Both lights are using alternating slow flickers. This signifies your heating system possibly has a flame problem. There might be a problem with its gas supply, gas valve or ignitor control. Contact us at 937-558-9478 for assistance.
  8. An individual light flashes slowly while the other stays steady. This usually indicates your HVAC equipment’s limit switch is open. The switch stops your furnace from getting too hot. Call the specialists at Edington Heating & Cooling Inc for support.

Heating System Blower Works But No Warm Air

Here’s what might be wrong when you observe your heating equipment’s blower fan working, but you aren’t getting any warm air.

  • The duo of lights display alternate rapid flashes. This indicates your furnace ignitor may not be in working order. This component kindles gas in your HVAC equipment to produce warmth and should be fixed by a professional from Edington Heating & Cooling Inc.

Turn to Us for Expert Furnace Repair

When you need to have your HVAC equipment repaired without delay, depend on the specialists at Edington Heating & Cooling Inc. Our pros will fix the fault quickly and have your space feeling comfortable again soon. Get in touch with us at 937-558-9478 or contact us online to get an appointment right away.