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

December 06, 2019

While your Lennox® heating system cannot chat with you, it has a process to communicate a furnace error.

Its control board has a set of LED lights that can display a fault code. Based on the problem, your furnace could use continuous or flashing lights.

Though there are certain basic furnace fixes you can finish yourself, many services are best taken care of by the professionals. When your heating system will not kick on or provide heated air, get in touch with Anderson Heating & A/C at 775-230-7628 for professional furnace repair in Carson City.

Our specialists will speedily determine and handle the failure, even if you don’t own a Lennox heating system. We can fix all types or makes—and get the comfort reintroduced to your house quickly.


What Does the Flashing Light on My Heating System Mean?

Your heater depends on lights to flash code when it requires repairs. It also uses these lights to relay it’s working correctly.

Regular function involves:

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

If you notice a single light going on and off slowly and the other going on and off fast, your heater might be experiencing a low flame signal. This can occur even when your furnace is running correctly. It indicates the flame sensing rod may be dirty or in the wrong area on the burner. Contact us at 775-230-7628 for assistance.

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

Furnace Won’t Turn On

Here are a few of the light sequences you might notice when your furnace will not or keep heating. The bulk of these problems must be handled by a specialist, such as one from Anderson Heating & A/C.

  1. Both LED lights are off. This signifies your furnace might not have power. Examine the breaker box to ensure the heater fuse isn’t triggered. You should reset the fuse if it is in the “off” area. If it promptly flips after you reset it, leave the breaker alone and get in touch with us us at 775-230-7628.
  2. A single light is unchanging and the other is flickering slowly. This shows the flame rollout switch is may be malfunctioning. The component is an important safety guard that helps in preventing fires and carbon monoxide. You shouldn’t attempt to fix this issue yourself.
  3. One light is flickering rapidly and the other is flashing slowly. This often means power polarity has been reversed. Your furnace could have a wiring fault that calls for specialized support from Anderson Heating & A/C.
  4. The pair of lights are blinking slowly. This signifies your heater’s blower motor possibly isn’t working. This component moves heated air from the HVAC system into your house. We can aid in figuring out what’s causing an issue with this piece.
  5. A single light is flickering slowly and the other is flashing rapidly. This means your heater may have low voltage or a short circuit. Contact our technicians at 775-230-7628 for support.
  6. One light is flickering on, on and off while the other flickers on, off, on. This signifies there might be a problem with your HVAC system’s motherboard or wiring. Anderson Heating & A/C can pinpoint the fault and handle it.
  7. The pair of lights are using alternate slow flashes. This signifies your HVAC equipment possibly has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 775-230-7628 for assistance.
  8. One light flashes slowly while the other stays solid. This typically means your furnace’s limit switch is open. The switch keeps your HVAC system from overheating. Reach out to the pros at Anderson Heating & A/C for support.

Heating System Blower Operates But No Heat

Here’s what could be at fault when you hear your heating equipment’s blower fan working, but you aren’t gaining any warmth.

  • The pair of lights are giving every other fast flickers. This signifies your furnace ignitor may not be in working order. This part kindles energy in your HVAC equipment to create warmth and should be repaired by a technician from Anderson Heating & A/C.

Turn to Us for Expert Furnace Repair

When you need to have your HVAC equipment repaired quickly, trust the specialists at Anderson Heating & A/C. Our technicians will handle the issue promptly and have your space feeling relaxing again in a short time. Get in touch with us at 775-230-7628 or contact us online to get an appointment now.