Furnace troubleshooting

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

While your Lennox® heater can’t speak to you, it does have a method to tell you about a furnace error.

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

Though there are various elementary furnace fixes you can complete yourself, most tasks are best left to experts. When your heating system will not turn on or provide heated air, reach out to Stan's Heating, Inc at 541-286-6602 for skilled furnace repair in Ontario.

Our experts will swiftly diagnose and handle the malfunction, even if you don’t own a Lennox furnace. We can service all kinds or configuration—and get the heat restored to your home quickly.


What Does the Blinking Light on My Heating System Mean?

Your furnace depends on lights to flash code when it is malfunctioning. It also uses this system to let you know it’s running like it should.

Regular operation involves:

  • Both lights flash slowly—heating system operating like it should.
  • Both lights flash fast—heater is beginning to call for heat.

If you see a solitary light going on and off slowly and the other flashing fast, your furnace could be having a low flame signal. This can take place even when your heater is heating correctly. It signifies the flame sensing rod may need to be cleaned or in the wrong spot on the burner. Reach out to us at 541-286-6602 for help.

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

Heater Will Not Start

Here are a few of the light sequences you could see when your heater won’t turn on or stay on. The majority of these errors need to be handled by a technician, such as one from Stan's Heating, Inc .

  1. Both LED lights are extinguished. This indicates your furnace might not have electricity. Go to the breaker box to confirm the heating system fuse isn’t triggered. Attempt to reset the fuse if it has moved into the “off” area. If it rapidly flips after you reset it, leave the breaker alone and call us at 541-286-6602.
  2. One light is stable and the other is blinking slowly. This signifies the flame rollout switch is possibly malfunctioning. The part is an essential safety mechanism that helps in avoiding fires and carbon monoxide. You shouldn’t seek to handle this issue yourself.
  3. One light is flashing quickly and the other is flickering slowly. This often signifies power polarity has been inverted. Your heating system might have a wiring issue that requires expert help from Stan's Heating, Inc .
  4. Both lights are flickering slowly. This signifies your heating system’s blower motor possibly isn’t operating. This component sends heated air from the furnace into your residence. We can help in pinpointing what’s causing an issue with this piece.
  5. One light is flashing slowly and the other is flashing fast. This means your heating system could have insufficient voltage or a short circuit. Call our experts at 541-286-6602 for support.
  6. One light is flickering on, on and off while the other blinks on, off, on. This indicates there might be an error with your heater’s control board or wiring. Stan's Heating, Inc can pinpoint the fault and repair it.
  7. The pair of lights show alternating slow flashes. This means your furnace likely has a flame issue. There may be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 541-286-6602 for support.
  8. A single light flickers slowly while the other remains solid. This typically signifies your HVAC system’s limit switch is malfunctioning. The switch keeps your HVAC system from getting too hot. Call the pros at Stan's Heating, Inc for support.

Heating System Blower Works But No Warmth

Here’s what might be wrong when you hear your heating system’s blower fan on, but you aren’t gaining any heated air.

  • The pair of lights display alternating rapid flickers. This means your furnace ignitor may not be working. This component kindles energy in your heating system to make warm air and should be fixed by a technician from Stan's Heating, Inc .

Depend on Us for Professional Furnace Repair

When you have to get your heating system repaired fast, trust the experts at Stan's Heating, Inc . Our pros will fix the problem promptly and have your rooms feeling comfortable again soon. Contact us at 541-286-6602 or contact us online to schedule an appointment now.

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