Furnace troubleshooting

Top Lennox® Furnace Error Codes (and What They Mean)

While your Lennox® heating system cannot talk to you, it has a method to get your attention when there’s a furnace error.

Its control panel has twin LED lights that can display a fault code. Subject to the issue, your heater could show continuous or flashing lights.

While there are certain basic heating fixes you can take care of without an expert, many fixes are best left to experts. When your furnace won’t turn on or give heat, contact Vogts Heating & Air at 208-621-0129 for experienced furnace repair in Pocatello.

Our technicians will quickly spot and handle the failure, even if you don’t use a Lennox heater. We can service any brands or makes—and get the comfort returned to your house fast.

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What Does the Flickering Light on My Heater Mean?

Your heating system uses lights to flash code when it is malfunctioning. It also uses this setup to relay it’s working properly.

Correct function consists of:

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

If you realize that one light blinking slowly and the other flashing quickly, your heater may have a low flame signal. This can occur even when your heating system is heating properly. It signifies the flame sensing rod may be dirty or in the incorrect spot on the burner. Reach out to us at 208-621-0129 for support.

Here are some of the most typical errors for Lennox heaters.

Furnace Won’t Start

Here are a few of the light sequences you could see when your heater won’t turn on or keep heating. The majority of these errors have to be repaired by a technician, like one from Vogts Heating & Air.

  1. The duo of LED lights aren’t lit. This indicates your HVAC system might not be receiving power. Go to the breaker box to make sure the furnace fuse has not triggered. Try resetting the fuse if it is in the “off” position. If it rapidly turns off following a reset, leave the breaker alone and get in touch with us us at 208-621-0129.
  2. A single light is stable and the other is blinking slowly. This means the flame rollout switch is likely malfunctioning. The part is an essential safety mechanism that aids in stopping fires and carbon monoxide. You shouldn’t try to handle this fault yourself.
  3. One light is flickering fast and the other is flashing slowly. This usually signifies power polarity has been inverted. Your furnace may have a wiring problem that calls for professional support from Vogts Heating & Air.
  4. Both lights are flashing slowly. This signifies your furnace’s blower motor probably isn’t working. This component circulates hot air from the HVAC system into your home. We can assist in pinpointing what’s causing a problem with this piece.
  5. One light is blinking slowly and the other is flickering rapidly. This signifies your heater may have not enough voltage or a short circuit. Get in touch with our professionals at 208-621-0129 for help.
  6. One light is flashing on, on and off while the other blinks on, off, on. This indicates there might be an error with your heater’s control panel or wiring. Vogts Heating & Air can pinpoint the problem and take care of it.
  7. The pair of lights show every other slow flickers. This indicates your furnace likely has a flame issue. There could be trouble with its gas supply, gas valve or ignitor control. Reach out to us at 208-621-0129 for assistance.
  8. An individual light flickers slowly while the other is steady. This usually means your heating system’s limit switch is not working. The switch keeps your HVAC system from getting too hot. Call the pros at Vogts Heating & Air for support.

Furnace Blower Runs But No Heat

Here’s what could be at fault when you notice your heating equipment’s blower fan on, but you aren’t getting any warmth.

  • The duo of lights are showing every other fast flickers. This means your furnace ignitor might be broken. This part kindles fuel in your HVAC equipment to produce heat and should be repaired by a specialist from Vogts Heating & Air.

Trust Us for Expert Furnace Repair

When you need to have your HVAC equipment fixed fast, turn to the professionals at Vogts Heating & Air. Our technicians will take care of the issue without delay and have your house feeling cozy again soon. Reach out to us at 208-621-0129 or contact us online to get an appointment today.

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