Furnace troubleshooting

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

While your Lennox® HVAC equipment cannot talk to you, it does have a way to get your attention when there’s a furnace error.

Its control board has double LED lights that can share a fault code. Based on the issue, your heating system could display continuous or flashing lights.

Although there are some simple HVAC repairs you can take care of yourself, the majority of tasks are best taken care of by experts. When your furnace refuses to turn on or put out warm air, contact B&W Services at 972-695-2264 for professional furnace repair in Royse City.

Our technicians will swiftly pinpoint and handle the failure, even if you don’t own a Lennox furnace. We can service all kinds or makes—and get the warmth reintroduced to your home quickly.


What Does the Flickering Light on My Furnace Mean?

Your heating system uses lights to flash code when it requires repairs. It also uses this system to let you know it’s working correctly.

Regular operation includes:

  • Both lights flash slowly—heating system operating properly.
  • Both lights flash fast—heater is initiating the call for heat.

If you realize that one light blinking slowly and the other going on and off fast, your heater may be experiencing a low flame signal. This can take place even when your heating system is heating properly. It signifies the flame sensing rod might be dirty or in the incorrect location on the burner. Reach out to us at 972-695-2264 for support.

Here are a few other of the most typical issues for Lennox heaters.

Furnace Refuses to Start

Here are many of the light patterns you could observe when your heat refuses to or stay on. The bulk of these issues need to be handled by a technician, such as one from B&W Services.

  1. The duo of LED lights are extinguished. This indicates your HVAC system might not have power. Look at the breaker box to ensure the furnace fuse hasn’t tripped. You should reset the fuse if it is in the “off” spot. If it rapidly flips after a subsequent reset, don’t touch the breaker and get in touch with us us at 972-695-2264.
  2. A single light is unchanging and the other is blinking slowly. This implies the flame rollout switch is may be open. The switch is a critical safety device that assists in avoiding fires and carbon monoxide. You shouldn’t attempt to take care of this issue on your own.
  3. An individual light is blinking quickly and the other is flashing slowly. This typically indicates power polarity has been reversed. Your furnace might have a wiring fault that calls for expert assistance from B&W Services.
  4. The duo of lights are flashing slowly. This means your furnace’s blower motor probably isn’t working. This part circulates heated air from the furnace into your space. We can help in pinpointing what’s causing an issue with this component.
  5. One light is flickering slowly and the other is blinking rapidly. This means your furnace could have not enough voltage or a short circuit. Get in touch with our specialists at 972-695-2264 for help.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there might be a malfunction with your HVAC system’s motherboard or wiring. B&W Services can find the error and handle it.
  7. The pair of lights show every other slow flickers. This signifies your heating system possibly has a flame problem. There might be trouble with its gas supply, gas valve or ignitor control. Reach out to us at 972-695-2264 for assistance.
  8. One light blinks slowly while the other stays steady. This often signifies your HVAC equipment’s limit switch is malfunctioning. The switch stops your heating system from overheating. Contact the experts at B&W Services for help.

Heating System Blower Works But No Warmth

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

  • Both lights display alternate quick flickers. This means your furnace ignitor might not be working. This piece kindles fuel in your HVAC equipment to produce warm air and should be fixed by an expert from B&W Services.

Turn to Us for Professional Furnace Repair

When you have to get your HVAC equipment fixed without delay, depend on the specialists at B&W Services. Our techs will take care of the fault without delay and have your space feeling comfortable again soon. Get in touch with us at 972-695-2264 or contact us online to request an appointment now.

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