Furnace troubleshooting

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

While your Lennox® heater cannot speak to you, it possesses a way to get your attention when there’s a furnace error.

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

Although there are a few basic heating fixes you can finish without an expert, most services are best handled by experts. When your heating system refuses to kick on or provide warm air, contact Select Comfort System Heating & Air Conditioning at 801-305-4777 for expert furnace repair in West Valley City.

Our technicians will speedily detect and repair the fault, even if you don’t use a Lennox furnace. We can service whichever kinds or configuration—and get the heat reintroduced to your residence quickly.


What Does the Flashing Light on My Heating System Mean?

Your heater uses lights to flash code when it requires repairs. It also engages this system to let you know it’s running like it should.

Correct function consists of:

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

If you notice one light flashing slowly and the other blinking rapidly, your heating system might be having a low flame signal. This can take place even when your furnace is running correctly. It means the flame sensing rod might be dirty or in the incorrect spot on the burner. Contact us at 801-305-4777 for assistance.

Here are several other of the most routine issues for Lennox furnaces.

Heater Will Not Turn On

Here are a few of the light patterns you could see when your heat will not or stay on. The majority of these errors have to be fixed by a specialist, for instance from Select Comfort System Heating & Air Conditioning.

  1. The pair of LED lights aren’t lit. This means your furnace might not be receiving power. Look at the breaker box to confirm the heating system fuse isn’t triggered. You should reset the fuse if it has moved into the “off” spot. If it immediately turns off after a subsequent reset, don’t touch the breaker and call us at 801-305-4777.
  2. A single light is continuous and the other is blinking slowly. This implies the flame rollout switch is may be malfunctioning. The part is an essential safety guard that aids in preventing fires and carbon monoxide. You shouldn’t seek to handle this issue yourself.
  3. One light is blinking rapidly and the other is blinking slowly. This typically signifies power polarity has been reversed. Your heating system may have a wiring problem that needs expert aid from Select Comfort System Heating & Air Conditioning.
  4. The pair of lights are flickering slowly. This means your furnace’s blower motor possibly isn’t running. This piece sends warm air from the furnace into your residence. We can aid in determining what’s causing an issue with this component.
  5. One light is flickering slowly and the other is flickering rapidly. This means your HVAC system may have low voltage or a short circuit. Call our professionals at 801-305-4777 for support.
  6. One light is blinking on, on and off while the other blinks on, off, on. This means there could be a malfunction with your heater’s control board or wiring. Select Comfort System Heating & Air Conditioning can locate the fault and repair it.
  7. The pair of lights are using every other slow flashes. This means your furnace likely has a flame issue. There may be a problem with its gas supply, gas valve or ignitor control. Reach out to us at 801-305-4777 for help.
  8. An individual light blinks slowly while the other remains solid. This often signifies your HVAC equipment’s limit switch is experiencing an error. The switch stops your heating system from becoming too warm. Reach out to the professionals at Select Comfort System Heating & Air Conditioning for support.

Furnace Blower Works But No Warmth

Here’s what might be at fault when you observe your heater’s blower fan running, but you aren’t receiving any warmth.

  • The pair of lights display alternate rapid flashes. This signifies your furnace ignitor might not be in working order. This part ignites energy in your heater to produce warmth and should be repaired by a professional from Select Comfort System Heating & Air Conditioning.

Depend on Us for Skilled Furnace Repair

When you need to have your furnace fixed without delay, trust the technicians at Select Comfort System Heating & Air Conditioning. Our technicians will handle the issue quickly and have your rooms feeling comfortable again in no time. Call us at 801-305-4777 or contact us online to schedule an appointment now.

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