Furnace troubleshooting

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

While your Lennox® heater can’t speak to you, it possesses a method to get your attention when there’s a furnace error.

Its motherboard has twin LED lights that can share a fault code. Based on the failure, your heater may use steady or flashing lights.

Though there are various basic heating fixes you can take care of without an expert, many repairs are best left to experts. When your heating system won’t kick on or deliver warm air, get in touch with Herman Allen Plumbing, Heating & Cooling at 804-302-6657 for professional furnace repair in Greater Richmond.

Our technicians will speedily spot and take care of the breakdown, even if you don’t own a Lennox heating system. We can repair any kinds or models—and get the heat returned to your residence without delay.


What Does the Flickering Light on My Heater Mean?

Your heater relies on lights to flash code when it needs to be repaired. It also engages these lights to relay it’s running properly.

Normal function includes:

  • Both lights flash slowly—furnace working properly.
  • Concurrent fast flash—heating system is initiating the call for heat.

If you see a lone light flashing slowly and the other going on and off rapidly, your heating system might be experiencing a low flame signal. This can take place even when your furnace is operating properly. It indicates the flame sensing rod might be dirty or in the wrong area on the burner. Call us at 804-302-6657 for assistance.

Here are several other of the most common faults for Lennox heating systems.

Furnace Refuses to Turn On

Here are many of the light sequences you might observe when your heating system will not or keep running. The majority of these errors must be fixed by a professional, such as one from Herman Allen Plumbing, Heating & Cooling.

  1. Both LED lights are extinguished. This indicates your HVAC system might not be receiving power. Go to the breaker box to make sure the furnace fuse is not tripped. You should reset the fuse if it is in the “off” position. If it immediately turns off after a subsequent reset, don’t touch the breaker and get in touch with us us at 804-302-6657.
  2. An individual light is unchanging and the other is flashing slowly. This shows the flame rollout switch is probably open. The switch is an essential safety mechanism that helps in avoiding fires and carbon monoxide. You shouldn’t try to fix this malfunction yourself.
  3. An individual light is blinking quickly and the other is flickering slowly. This likely means power polarity has been reversed. Your furnace might have a wiring fault that calls for expert help from Herman Allen Plumbing, Heating & Cooling.
  4. The duo of lights are flashing slowly. This signifies your furnace’s blower motor possibly isn’t working. This part moves heated air from the HVAC system into your house. We can assist in determining what’s wrong with this piece.
  5. A single light is flashing slowly and the other is flashing quickly. This indicates your furnace could have not enough voltage or a short circuit. Reach out to our experts at 804-302-6657 for assistance.
  6. One light is flashing on, on and off while the other blinks on, off, on. This signifies there may be a problem with your HVAC system’s control panel or wiring. Herman Allen Plumbing, Heating & Cooling can find the error and take care of it.
  7. The duo of lights display every other slow flickers. This signifies your furnace likely has a flame problem. There might be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 804-302-6657 for help.
  8. An individual light flickers slowly while the other stays continuous. This typically indicates your HVAC equipment’s limit switch is experiencing an error. The switch prevents your heating system from overheating. Reach out to the pros at Herman Allen Plumbing, Heating & Cooling for support.

Heating System Blower Operates But No Heat

Here’s what may be broken when you notice your heater’s blower fan running, but you aren’t getting any heated air.

  • The duo of lights are showing alternating rapid blinks. This means your furnace ignitor might not be working. This part lights energy in your heater to make warmth and should be fixed by a specialist from Herman Allen Plumbing, Heating & Cooling.

Turn to Us for Professional Furnace Repair

When you have to have your heater repaired without delay, depend on the experts at Herman Allen Plumbing, Heating & Cooling. Our technicians will handle the issue quickly and have your space feeling comfortable again in a short time. Call us at 804-302-6657 or contact us online to request an appointment right away.

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