Furnace troubleshooting

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

While your Lennox® heating system isn’t able to chat with you, it does have a process to communicate a furnace error.

Its control panel has double LED lights that can share a fault code. Based on the problem, your heating system may use continuous or flashing lights.

Though there are certain basic furnace fixes you can take care of on your own, the majority of services are best taken care of by experts. When your heating system refuses to kick on or give warmth, contact Clean Air HVAC at 925-233-6238 for skilled furnace repair in Pacheco.

Our technicians will swiftly discover and repair the malfunction, even if you don’t own a Lennox furnace. We can fix whichever brands or models—and get the warmth returned to your house without delay.


What Does the Flickering Light on My Heating System Mean?

Your heater depends on lights to flash code when it requires repairs. It also engages this system to relay it’s running like it should.

Regular heating includes:

  • Both lights flash slowly—heater operating properly.
  • Simultaneous fast flash—heater is beginning to call for heat.

If you see one light going on and off slowly and the other going on and off rapidly, your heating system may have a low flame signal. This can take place even when your furnace is operating correctly. It means the flame sensing rod may be dirty or in the incorrect location on the burner. Call us at 925-233-6238 for support.

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

Furnace Refuses to Turn On

Here are many of the light sequences you may notice when your heat refuses to or keep heating. The majority of these errors have to be taken care of by a technician, for instance from Clean Air HVAC.

  1. The duo of LED lights are off. This indicates your heater might not have electricity. Go to the breaker box to ensure the heating system fuse hasn’t tripped. You should reset the fuse if it has moved into the “off” position. If it instantly flips after a subsequent reset, don’t try to reset it again and get in touch with us us at 925-233-6238.
  2. One light is continuous and the other is flickering slowly. This signifies the flame rollout switch is probably not working right. The component is an essential safety guard that helps in stopping fires and carbon monoxide. You shouldn’t attempt to take care of this fault without professional help.
  3. A single light is flashing quickly and the other is flickering slowly. This typically means power polarity has been reversed. Your furnace may have a wiring fault that requires professional assistance from Clean Air HVAC.
  4. Both lights are blinking slowly. This means your heating system’s blower motor likely isn’t working. This part distributes hot air from the heater into your home. We can assist in figuring out what’s causing an issue with this component.
  5. An individual light is flickering slowly and the other is blinking rapidly. This indicates your heating system could have insufficient voltage or a short circuit. Get in touch with our experts at 925-233-6238 for assistance.
  6. One light is flashing on, on and off while the other flickers on, off, on. This means there could be a problem with your heating system’s control panel or wiring. Clean Air HVAC can locate the issue and repair it.
  7. The duo of lights show alternating slow flickers. This means your furnace may have a flame problem. There might be an issue with its gas supply, gas valve or ignitor control. Call us at 925-233-6238 for support.
  8. One light flickers slowly while the other stays steady. This usually indicates your HVAC equipment’s limit switch is open. The switch keeps your heating system from overheating. Contact the experts at Clean Air HVAC for assistance.

Furnace Blower Runs But No Heat

Here’s what could be broken when you notice your heating equipment’s blower fan working, but you aren’t receiving any heated air.

  • The pair of lights are giving alternating rapid flickers. This indicates your furnace ignitor may not be in working order. This part lights energy in your HVAC equipment to create warmth and should be serviced by a technician from Clean Air HVAC.

Trust Us for Expert Furnace Repair

When you need to get your HVAC equipment fixed fast, depend on the technicians at Clean Air HVAC. Our pros will fix the problem quickly and have your home feeling cozy again in no time. Call us at 925-233-6238 or contact us online to request an appointment today.

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