Furnace troubleshooting

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

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

Its control board has a set of LED lights that can share a fault code. Based on the problem, your heater might show solid or flashing lights.

While there are a few basic furnace fixes you can take care of on your own, many services are best left to experts. When your heater refuses to turn on or provide warm air, call Bishop Heating & Air Conditioning at 760-784-9034 for expert furnace repair in Bishop.

Our experts will quickly detect and handle the breakdown, even if you don’t own a Lennox heater. We can service any kinds or configuration—and get the comfort restored to your home without delay.


What Does the Blinking Light on My Heater Mean?

Your furnace uses lights to flash code when it isn’t working right. It also works these lights to tell you it’s heating properly.

Correct operation includes:

  • Concurrent slow flash—furnace running properly.
  • Simultaneous fast flash—furnace is starting to call for heat.

If you realize that a lone light blinking slowly and the other going on and off rapidly, your heating system may be experiencing a low flame signal. This can take place even when your heating system is running like it should. It means the flame sensing rod might be dirty or in the wrong spot on the burner. Reach out to us at 760-784-9034 for support.

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

Furnace Refuses to Kick On

Here are some of the light patterns you might observe when your heat refuses to or keep running. The majority of these issues must be taken care of by an expert, such as one from Bishop Heating & Air Conditioning.

  1. Both LED lights aren’t lit. This signifies your heater might not have power. Look at the breaker box to make sure the furnace fuse has not tripped. Attempt to reset the fuse if it is in the “off” area. If it rapidly trips following a reset, don’t try to reset it again and get in touch with us us at 760-784-9034.
  2. An individual light is stable and the other is flashing slowly. This means the flame rollout switch is possibly malfunctioning. The component is an essential safety mechanism that aids in preventing fires and carbon monoxide. You shouldn’t seek to fix this issue on your own.
  3. A single light is flickering quickly and the other is flickering slowly. This often means power polarity has been transposed. Your furnace may have a wiring fault that needs expert help from Bishop Heating & Air Conditioning.
  4. All lights are blinking slowly. This indicates your furnace’s blower motor possibly isn’t operating. This component circulates hot air from the furnace into your residence. We can assist in determining what’s wrong with this piece.
  5. A single light is blinking slowly and the other is blinking fast. This means your heater could have not enough voltage or a short circuit. Reach out to our technicians at 760-784-9034 for support.
  6. One light is flickering on, on and off while the other blinks on, off, on. This indicates there could be an issue with your furnace’s motherboard or wiring. Bishop Heating & Air Conditioning can find the issue and take care of it.
  7. Both lights show every other slow flickers. This means your heater likely has a flame error. There may be trouble with its gas supply, gas valve or ignitor control. Contact us at 760-784-9034 for assistance.
  8. One light flickers slowly while the other stays continuous. This usually means your heating system’s limit switch is experiencing an error. The switch prevents your furnace from overheating. Reach out to the pros at Bishop Heating & Air Conditioning for help.

Heater Blower Works But No Heat

Here’s what may be at fault when you notice your heating system’s blower fan on, but you aren’t getting any heat.

  • The pair of lights display alternating quick blinks. This indicates your furnace ignitor may not be in working order. This component kindles gas in your HVAC equipment to create warmth and should be fixed by a technician from Bishop Heating & Air Conditioning.

Depend on Us for Skilled Furnace Repair

When you have to get your heater repaired quickly, trust the specialists at Bishop Heating & Air Conditioning. Our technicians will take care of the issue promptly and have your rooms feeling cozy again in no time. Reach out to us at 760-784-9034 or contact us online to get an appointment today.

Back To Blog