Furnace troubleshooting

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

While your Lennox® furnace cannot talk to you, it possesses a method to tell you about a furnace error.

Its control board has twin LED lights that can display a fault code. Based on the issue, your furnace might use steady or flashing lights.

While there are various basic HVAC adjustments you can take care of without an expert, most services are best left to the professionals. When your heater will not kick on or give warm air, reach out to True Temp Heating & Air Inc at 706-695-7492 for professional furnace repair in Chatsworth.

Our technicians will speedily pinpoint and take care of the issue, even if you don’t use a Lennox furnace. We can fix all types or makes—and get the heat reintroduced to your home quickly.


What Does the Blinking Light on My Furnace Mean?

Your heater relies on lights to flash code when it needs to be repaired. It also uses this system to let you know it’s running properly.

Regular heating consists of:

  • Both lights flash slowly—furnace running properly.
  • Simultaneous fast flash—heater is initiating the call for heat.

If you see a lone light flashing slowly and the other flashing quickly, your heating system could be experiencing a low flame signal. This can take place even when your furnace is running like it should. It signifies the flame sensing rod may need to be cleaned or in the bad location on the burner. Reach out to us at 706-695-7492 for assistance.

Here are some of the most typical problems for Lennox heating systems.

Heater Refuses to Start

Here are some of the light arrangements you could observe when your heat will not or stay on. The bulk of these issues must be taken care of by an expert, like one from True Temp Heating & Air Inc.

  1. The pair of LED lights are off. This indicates your heating system might not have power. Examine the breaker box to make sure the furnace fuse hasn’t triggered. Try resetting the fuse if it is in the “off” spot. If it instantly turns off after you reset it, don’t try to reset it again and contact us at 706-695-7492.
  2. One light is stable and the other is flashing slowly. This implies the flame rollout switch is may be malfunctioning. The component is an essential safety mechanism that aids in preventing fires and carbon monoxide. You shouldn’t attempt to handle this malfunction yourself.
  3. An individual light is blinking quickly and the other is flashing slowly. This often means power polarity has been transposed. Your heating system may have a wiring error that requires expert aid from True Temp Heating & Air Inc.
  4. Both lights are flashing slowly. This indicates your furnace’s blower motor possibly isn’t operating. This component sends warm air from the furnace into your home. We can assist in pinpointing what’s causing an issue with this component.
  5. One light is flickering slowly and the other is blinking quickly. This signifies your heating system could have insufficient voltage or a short circuit. Get in touch with our technicians at 706-695-7492 for support.
  6. One light is flashing on, on and off while the other blinks on, off, on. This indicates there could be a malfunction with your heater’s control board or wiring. True Temp Heating & Air Inc can locate the issue and repair it.
  7. The duo of lights display alternate slow flickers. This indicates your furnace may have a flame error. There could be a problem with its gas supply, gas valve or ignitor control. Call us at 706-695-7492 for support.
  8. A single light blinks slowly while the other is solid. This often indicates your heating system’s limit switch is not working. The switch prevents your furnace from overheating. Get in touch with the experts at True Temp Heating & Air Inc for assistance.

Heater Blower Runs But No Warmth

Here’s what might be broken when you observe your furnace’s blower fan on, but you aren’t getting any heat.

  • The duo of lights are showing every other rapid flickers. This indicates your furnace ignitor could not be in working order. This component kindles energy in your HVAC equipment to create heat and should be repaired by an expert from True Temp Heating & Air Inc.

Depend on Us for Skilled Furnace Repair

When you have to get your HVAC equipment in working order fast, depend on the professionals at True Temp Heating & Air Inc. Our pros will repair the issue right away and have your house feeling relaxing again soon. Reach out to us at 706-695-7492 or contact us online to get an appointment today.

Back To Blog