Furnace troubleshooting

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

While your Lennox® HVAC equipment cannot talk to you, it has a procedure to tell you about a furnace error.

Its control board has two LED lights that can share a fault code. Depending on the issue, your heater might use solid or flashing lights.

While there are various elementary heating fixes you can finish on your own, many repairs are best handled by experts. When your heating system won’t start or give heated air, contact Anderson Heating & A/C at 775-230-7628 for professional furnace repair in Carson City.

Our specialists will rapidly discover and repair the issue, even if you don’t have a Lennox heating system. We can repair any kinds or configuration—and get the heat reintroduced to your residence fast.


What Does the Flashing Light on My Heating System Mean?

Your furnace depends on lights to flash code when it requires repairs. It also works these lights to tell you it’s operating like it should.

Correct function consists of:

  • Concurrent slow flash—furnace heating correctly.
  • Both lights flash fast—heating system is starting to call for heat.

If you notice a single light blinking slowly and the other blinking rapidly, your furnace may have a low flame signal. This can happen even when your heating system is heating like it should. It signifies the flame sensing rod may have build-up or in the incorrect area on the burner. Reach out to us at 775-230-7628 for help.

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

Furnace Will Not Turn On

Here are a few of the light patterns you could notice when your furnace refuses to or keep running. The bulk of these problems must be repaired by a technician, like one from Anderson Heating & A/C.

  1. The pair of LED lights are extinguished. This means your heating system might not be receiving power. Check the breaker box to confirm the furnace fuse isn’t triggered. Try resetting the fuse if it has moved into the “off” position. If it instantly flips following a reset, don’t touch the breaker and call us at 775-230-7628.
  2. One light is solid and the other is flashing slowly. This implies the flame rollout switch is probably open. The switch is an essential safety mechanism that helps in preventing fires and carbon monoxide. You shouldn’t seek to handle this fault on your own.
  3. A single light is flashing rapidly and the other is blinking slowly. This typically means power polarity has been reversed. Your furnace might have a wiring fault that requires expert aid from Anderson Heating & A/C.
  4. Both lights are blinking slowly. This means your furnace’s blower motor possibly isn’t operating. This component sends hot air from the heater into your rooms. We can help in pinpointing what’s wrong with this part.
  5. A single light is flashing slowly and the other is flashing rapidly. This means your HVAC system may have not enough voltage or a short circuit. Get in touch with our technicians at 775-230-7628 for assistance.
  6. One light is flickering on, on and off while the other flashes on, off, on. This signifies there could be an issue with your HVAC system’s control board or wiring. Anderson Heating & A/C can locate the issue and repair it.
  7. The pair of lights are using alternating slow flickers. This means your furnace may have a flame issue. There might be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 775-230-7628 for help.
  8. A single light flashes slowly while the other remains steady. This typically signifies your heating system’s limit switch is not working. The switch prevents your HVAC system from overheating. Reach out to the experts at Anderson Heating & A/C for support.

Heater Blower Runs But No Warm Air

Here’s what might be at fault when you notice your heating system’s blower fan running, but you aren’t getting any warmth.

  • The duo of lights are giving every other quick flickers. This indicates your furnace ignitor may not be in working order. This piece ignites energy in your heating system to produce heat and should be repaired by an expert from Anderson Heating & A/C.

Turn to Us for Professional Furnace Repair

When you have to get your furnace in working order without delay, trust the technicians at Anderson Heating & A/C. Our pros will take care of the problem promptly and have your home feeling relaxing again in no time. Contact us at 775-230-7628 or contact us online to request an appointment now.

Back To Blog