While your Lennox® furnace can’t talk to you, it has a method to tell you about a furnace error.

Its motherboard has twin LED lights that can share a fault code. Subject to the failure, your heating system might use steady or flashing lights.

While there are some elementary heating adjustments you can take care of without an expert, most tasks are best handled by HVAC technicians. When your heater refuses to turn on or deliver warmth, reach out to May's Heating & Air at 301-690-0397 for experienced furnace repair in Frederick.

Our experts will swiftly identify and handle the malfunction, even if you don’t own a Lennox heating system. We can fix any types or models—and get the warmth reintroduced to your home quickly.

What Does the Flashing Light on My Heater Mean?

Your heating system uses lights to flash code when it is malfunctioning. It also engages these lights to let you know it’s working like it should.

Regular operation includes:

  • Simultaneous slow flash—heater operating properly.
  • Both lights flash fast—furnace is initiating the call for heat.

If you see a single light blinking slowly and the other going on and off quickly, your furnace could be having a low flame signal. This can take place even when your heater is running properly. It indicates the flame sensing rod could have buildup or in the incorrect spot on the burner. Reach out to us at 301-690-0397 for support.

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

Heater Refuses to Start

Here are some of the light sequences you might see when your heat refuses to or keep operating. Most of these issues have to be repaired by a technician, such as one from May's Heating & Air.

  1. All LED lights are off. This signifies your heater might not be receiving power. Examine the breaker box to ensure the furnace fuse isn’t tripped. Attempt to reset the fuse if it’s in the “off” position. If it immediately trips following a reset, don’t touch the breaker and contact us at 301-690-0397.
  2. An individual light is continuous and the other is flickering slowly. This signifies the flame rollout switch is possibly not working right. The switch is a critical safety mechanism that aids in stopping fires and carbon monoxide. You shouldn’t seek to fix this issue yourself.
  3. A single light is flashing fast and the other is flickering slowly. This typically means power polarity has been reversed. Your heating system might have a wiring problem that needs professional assistance from May's Heating & Air.
  4. All lights are flashing slowly. This means your furnace’s blower motor likely isn’t operating. This piece distributes hot air from the furnace into your residence. We can aid in figuring out what’s causing a problem with this part.
  5. One light is flickering slowly and the other is flashing fast. This indicates your heating system could have low voltage or a short circuit. Reach out to our experts at 301-690-0397 for help.
  6. One light is flickering on, on, off while the other flickers on, off, on. This indicates there might be trouble with your heater’s control board or wiring. May's Heating & Air can determine the problem and handle it.
  7. The duo of lights display every other slow flickers. This signifies your heating system likely has a flame error. There might be an issue with its gas supply, gas valve or ignitor control. Contact us at 301-690-0397 for help.
  8. A single light flickers slowly while the other is continuous. This often means your heater’s limit switch is malfunctioning. The switch prevents your heating system from overheating. Get in touch with the pros at May's Heating & Air for help.

Furnace Blower Works But No Warm Air

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

  • The pair of lights display alternate quick flashes. This means your furnace ignitor could not be working. This part kindles gas in your heater to create warm air and should be serviced by a technician from May's Heating & Air.

Turn to Us for Skilled Furnace Repair

When you need to get your HVAC equipment fixed fast, turn to the specialists at May's Heating & Air. Our technicians will handle the error quickly and have your rooms feeling relaxing again in no time. Reach out to us at 301-690-0397 or contact us online to request an appointment now.