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

December 06, 2019

While your Lennox® heater can’t speak to you, it possesses a process to tell you about a furnace error.

Its control panel has twin LED lights that can show a fault code. Subject to the failure, your heater might use continuous or flashing lights.

Though there are a few basic HVAC fixes you can complete on your own, most repairs are best handled by experts. When your heater won’t start or give heated air, call Brookwood Inc at 641-316-9803 for skilled furnace repair in Newton.

Our specialists will swiftly spot and handle the malfunction, even if you don’t own a Lennox heating system. We can repair whichever kinds or models—and get the heat returned to your house fast.


What Does the Flashing Light on My Furnace Mean?

Your heating system relies on lights to flash code when it is malfunctioning. It also works these lights to relay it’s working like it should.

Normal function includes:

  • Concurrent slow flash—heating system working properly.
  • Simultaneous fast flash—heating system is beginning to call for heat.

If you see a single light blinking slowly and the other flashing rapidly, your furnace may be having a low flame signal. This can take place even when your heater is heating properly. It signifies the flame sensing rod could be dirty or in the incorrect spot on the burner. Call us at 641-316-9803 for support.

Here are several other of the most typical faults for Lennox HVAC systems.

Furnace Won’t Start

Here are some of the light sequences you could see when your furnace won’t turn on or keep heating. The majority of these errors need to be handled by a specialist, like one from Brookwood Inc.

  1. The pair of LED lights aren’t lit. This means your heating system might not be receiving power. Check the breaker box to make sure the heater fuse has not flipped. Try resetting the fuse if it is in the “off” area. If it rapidly trips following a reset, leave the breaker alone and get in touch with us us at 641-316-9803.
  2. A single light is stable and the other is flickering slowly. This means the flame rollout switch is likely malfunctioning. The component is a critical safety device that assists in preventing fires and carbon monoxide. You shouldn’t seek to fix this fault without professional help.
  3. One light is flashing fast and the other is blinking slowly. This likely indicates power polarity has been reversed. Your heating system might have a wiring fault that requires specialized aid from Brookwood Inc.
  4. Both lights are flickering slowly. This signifies your heating system’s blower motor possibly isn’t running. This component sends warm air from the heating system into your space. We can assist in figuring out what’s wrong with this component.
  5. A single light is blinking slowly and the other is flashing rapidly. This means your heating system could have not enough voltage or a short circuit. Contact our professionals at 641-316-9803 for help.
  6. One light is blinking on, on and off while the other flashes on, off, on. This signifies there may be a problem with your HVAC system’s control board or wiring. Brookwood Inc can determine the issue and handle it.
  7. The duo of lights display alternate slow flickers. This indicates your furnace may have a flame failure. There might be a problem with its gas supply, gas valve or ignitor control. Get in touch with us at 641-316-9803 for help.
  8. One light flickers slowly while the other stays solid. This often indicates your HVAC equipment’s limit switch is open. The switch prevents your furnace from becoming too warm. Call the specialists at Brookwood Inc for support.

Heater Blower Runs But No Heat

Here’s what may be broken when you notice your heating equipment’s blower fan working, but you aren’t gaining any warm air.

  • Both lights are giving alternate fast flickers. This means your furnace ignitor may be broken. This piece lights fuel in your HVAC equipment to produce heat and should be fixed by an expert from Brookwood Inc.

Trust Us for Expert Furnace Repair

When you have to have your HVAC equipment fixed without delay, trust the technicians at Brookwood Inc. Our technicians will handle the issue quickly and have your rooms feeling comfortable again in no time. Call us at 641-316-9803 or contact us online to request an appointment right away.