Furnace troubleshooting

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

While your Lennox® heater cannot chat with you, it possesses a process to tell you about a furnace error.

Its control panel has two LED lights that can show a fault code. Depending on the malfunction, your heater may use continuous or flashing lights.

While there are some elementary furnace repairs you can do without an expert, most tasks are best handled by the professionals. When your furnace refuses to kick on or give warm air, contact Dave's Diversified Services at 540-369-3971 for experienced furnace repair in Front Royal.

Our technicians will speedily discover and handle the breakdown, even if you don’t use a Lennox heater. We can service all kinds or configuration—and get the warmth reintroduced to your home without delay.


What Does the Flashing Light on My Furnace Mean?

Your heater depends on lights to flash code when it requires repairs. It also works this setup to tell you it’s running correctly.

Normal heating 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 blinking quickly, your heating system could be having a low flame signal. This can take place even when your heating system is running properly. It signifies the flame sensing rod might need to be cleaned or in the wrong area on the burner. Reach out to us at 540-369-3971 for support.

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

Heater Will Not Start

Here are many of the light arrangements you could see when your heating system will not or keep operating. The majority of these issues need to be fixed by a technician, like one from Dave's Diversified Services.

  1. The pair of LED lights aren’t lit. This means your furnace might not have electricity. Find the breaker box to make sure the heating system fuse is not tripped. Attempt to reset the fuse if it is in the “off” position. If it promptly trips after a subsequent reset, don’t try to reset it again and contact us at 540-369-3971.
  2. An individual light is unchanging and the other is blinking slowly. This shows the flame rollout switch is probably open. The part is an important safety tool that assists in preventing fires and carbon monoxide. You shouldn’t try to handle this fault on your own.
  3. An individual light is flickering quickly and the other is flashing slowly. This usually signifies power polarity has been reversed. Your heater might have a wiring error that requires professional support from Dave's Diversified Services.
  4. The pair of lights are flickering slowly. This signifies your furnace’s blower motor probably isn’t working. This part distributes warm air from the furnace into your home. We can assist in figuring out what’s wrong with this piece.
  5. An individual light is flashing slowly and the other is blinking rapidly. This means your furnace might have low voltage or a short circuit. Contact our experts at 540-369-3971 for support.
  6. One light is blinking on, on and off while the other blinks on, off, on. This signifies there might be an issue with your heating system’s motherboard or wiring. Dave's Diversified Services can determine the issue and take care of it.
  7. The pair of lights show alternating slow flashes. This means your heating system likely has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 540-369-3971 for support.
  8. An individual light blinks slowly while the other stays continuous. This often means your HVAC equipment’s limit switch is open. The switch prevents your HVAC equipment from getting too hot. Reach out to the pros at Dave's Diversified Services for help.

Heating System Blower Works But No Warmth

Here’s what may be wrong when you hear your heater’s blower fan running, but you aren’t getting any warm air.

  • The pair of lights are giving alternate quick flashes. This means your furnace ignitor may not be in working order. This component lights energy in your heater to produce warm air and should be serviced by an expert from Dave's Diversified Services.

Depend on Us for Professional Furnace Repair

When you need to have your heating system repaired without delay, turn to the professionals at Dave's Diversified Services. Our pros will fix the fault right away and have your rooms feeling relaxing again in no time. Contact us at 540-369-3971 or contact us online to request an appointment now.

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