Furnace troubleshooting

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

While your Lennox® HVAC equipment cannot chat with you, it possesses a process to get your attention when there’s a furnace error.

Its control board has double LED lights that can display a fault code. Depending on the issue, your furnace may display continuous or flashing lights.

While there are certain basic HVAC repairs you can do without an expert, the majority of fixes are best taken care of by HVAC technicians. When your furnace will not kick on or give warm air, reach out to Tokay Heating and Air Conditioning at 209-257-3156 for expert furnace repair in Lodi.

Our technicians will quickly detect and take care of the fault, even if you don’t have a Lennox heating system. We can repair whichever kinds or makes—and get the comfort reintroduced to your house quickly.


What Does the Blinking Light on My Heater Mean?

Your heating system depends on lights to flash code when it needs to be repaired. It also works these lights to let you know it’s working properly.

Correct function includes:

  • Simultaneous slow flash—furnace heating correctly.
  • Both lights flash fast—furnace is initiating the call for heat.

If you notice a lone light flashing slowly and the other going on and off quickly, your heating system may be having a low flame signal. This can happen even when your furnace is working properly. It indicates the flame sensing rod might have build-up or in the wrong area on the burner. Reach out to us at 209-257-3156 for support.

Here are several other of the most typical problems for Lennox HVAC systems.

Heating System Won’t Kick On

Here are a few of the light sequences you might observe when your furnace refuses to or keep operating. Most of these problems have to be handled by a professional, for instance from Tokay Heating and Air Conditioning.

  1. All LED lights are extinguished. This indicates your HVAC system might not have electricity. Look at the breaker box to make sure the heating system fuse is not flipped. Try resetting the fuse if it has moved into the “off” area. If it rapidly turns off following a reset, don’t try to reset it again and contact us at 209-257-3156.
  2. A single light is unchanging and the other is flickering slowly. This implies the flame rollout switch is probably malfunctioning. The switch is an important safety tool that helps in avoiding fires and carbon monoxide. You shouldn’t seek to handle this fault yourself.
  3. An individual light is flickering rapidly and the other is flickering slowly. This likely signifies power polarity has been transposed. Your heating system may have a wiring issue that requires professional aid from Tokay Heating and Air Conditioning.
  4. All lights are flashing slowly. This means your heater’s blower motor possibly isn’t working. This part moves warm air from the heater into your space. We can aid in determining what’s causing an issue with this piece.
  5. One light is blinking slowly and the other is blinking quickly. This indicates your heating system might have insufficient voltage or a short circuit. Reach out to our technicians at 209-257-3156 for assistance.
  6. One light is blinking on, on and off while the other flashes on, off, on. This signifies there may be an issue with your heating system’s motherboard or wiring. Tokay Heating and Air Conditioning can find the error and repair it.
  7. The duo of lights display alternate slow flickers. This indicates your furnace possibly has a flame issue. There could be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 209-257-3156 for assistance.
  8. A single light blinks slowly while the other remains steady. This typically signifies your heater’s limit switch is experiencing an error. The switch prevents your heater from getting too hot. Get in touch with the experts at Tokay Heating and Air Conditioning for support.

Heater Blower Works But No Warmth

Here’s what could be broken when you hear your heater’s blower fan working, but you aren’t gaining any heat.

  • The duo of lights are showing every other quick flickers. This means your furnace ignitor may not be in working order. This part kindles gas in your furnace to make warmth and should be repaired by a professional from Tokay Heating and Air Conditioning.

Trust Us for Expert Furnace Repair

When you have to have your heating system repaired quickly, turn to the specialists at Tokay Heating and Air Conditioning. Our techs will fix the fault quickly and have your space feeling cozy again in a short time. Reach out to us at 209-257-3156 or contact us online to schedule an appointment today.

Back To Blog