Furnace troubleshooting

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

While your Lennox® HVAC equipment isn’t able to talk to you, it has a process to tell you about a furnace error.

Its motherboard has a set of LED lights that can display a fault code. Based on the failure, your furnace may show continuous or flashing lights.

While there are various simple furnace repairs you can do yourself, most tasks are best handled by HVAC technicians. When your furnace refuses to turn on or put out warmth, reach out to Van Haaften Plumbing & Heating at 641-628-3621 for skilled furnace repair in Pella.

Our experts will speedily diagnose and repair the problem, even if you don’t own a Lennox heater. We can repair any brands or makes—and get the heat reintroduced to your residence without delay.


What Does the Blinking Light on My Heating System Mean?

Your heating system relies on lights to flash code when it requires repairs. It also works this system to relay it’s working properly.

Correct operation consists of:

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

If you realize that one light going on and off slowly and the other going on and off rapidly, your heating system may have a low flame signal. This can occur even when your heating system is heating properly. It signifies the flame sensing rod may be dirty or in the wrong area on the burner. Reach out to us at 641-628-3621 for support.

Here are some of the most typical errors for Lennox furnaces.

Heating System Will Not Turn On

Here are a few of the light sequences you could notice when your heat refuses to or keep heating. Most of these errors need to be fixed by an expert, such as one from Van Haaften Plumbing & Heating.

  1. The pair of LED lights aren’t lit. This means your heater might not have power. Examine the breaker box to confirm the heating system fuse has not triggered. Try resetting the fuse if it is in the “off” position. If it rapidly flips after you reset it, don’t touch the breaker and call us at 641-628-3621.
  2. One light is continuous and the other is flashing slowly. This means the flame rollout switch is possibly not working right. The component is an important safety mechanism that aids in avoiding fires and carbon monoxide. You shouldn’t try to repair this fault yourself.
  3. One light is blinking fast and the other is flickering slowly. This typically indicates power polarity has been inverted. Your furnace may have a wiring error that needs professional assistance from Van Haaften Plumbing & Heating.
  4. The pair of lights are blinking slowly. This indicates your heating system’s blower motor probably isn’t running. This component moves warm air from the heating system into your residence. We can aid in pinpointing what’s causing a problem with this piece.
  5. One light is blinking slowly and the other is flickering rapidly. This indicates your furnace could have not enough voltage or a short circuit. Get in touch with our experts at 641-628-3621 for assistance.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there may be a fault with your heater’s motherboard or wiring. Van Haaften Plumbing & Heating can locate the issue and take care of it.
  7. The duo of lights display every other slow flashes. This means your HVAC system possibly has a flame failure. There might be trouble with its gas supply, gas valve or ignitor control. Contact us at 641-628-3621 for support.
  8. An individual light blinks slowly while the other remains continuous. This usually means your furnace’s limit switch is not working. The switch stops your HVAC system from becoming too warm. Call the pros at Van Haaften Plumbing & Heating for help.

Heater Blower Runs But No Warm Air

Here’s what might be wrong when you observe your furnace’s blower fan running, but you aren’t getting any warm air.

  • The pair of lights display every other rapid flickers. This signifies your furnace ignitor might be broken. This component kindles gas in your heater to make warmth and should be serviced by a specialist from Van Haaften Plumbing & Heating.

Turn to Us for Skilled Furnace Repair

When you need to get your heater repaired quickly, depend on the professionals at Van Haaften Plumbing & Heating. Our pros will take care of the issue quickly and have your house feeling comfortable again in a short time. Reach out to us at 641-628-3621 or contact us online to schedule an appointment now.

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