Furnace troubleshooting

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

While your Lennox® HVAC equipment can’t chat with you, it has a method to tell you about a furnace error.

Its motherboard has two LED lights that can display a fault code. Based on the issue, your heating system could show continuous or flashing lights.

While there are certain basic furnace adjustments you can finish yourself, the majority of services are best handled by HVAC technicians. When your heater refuses to start or provide heated air, contact Jack's Heating, Cooling, Stoves & Fireplaces at 308-646-3827 for professional furnace repair in Alliance.

Our experts will speedily spot and repair the breakdown, even if you don’t own a Lennox furnace. We can fix any brands or makes—and get the warmth restored to your residence quickly.


What Does the Flashing Light on My Heating System Mean?

Your heater uses lights to flash code when it needs to be repaired. It also engages this setup to let you know it’s working properly.

Correct function involves:

  • Simultaneous slow flash—heater heating like it should.
  • Simultaneous fast flash—heater is beginning to call for heat.

If you see a solitary light flashing slowly and the other going on and off fast, your heating system may be experiencing a low flame signal. This can occur even when your furnace is operating like it should. It means the flame sensing rod could be dirty or in the wrong area on the burner. Reach out to us at 308-646-3827 for support.

Here are some of the most routine issues for Lennox heating systems.

Furnace Won’t Start

Here are some of the light arrangements you may observe when your heat won’t turn on or keep running. Most of these errors must be fixed by an expert, like one from Jack's Heating, Cooling, Stoves & Fireplaces.

  1. The pair of LED lights are off. This means your furnace might not have electricity. Find the breaker box to confirm the heater fuse is not triggered. Attempt to reset the fuse if it is in the “off” spot. If it promptly trips after you reset it, leave the breaker alone and get in touch with us us at 308-646-3827.
  2. An individual light is continuous and the other is blinking slowly. This means the flame rollout switch is may be malfunctioning. The switch is an essential safety tool that aids in avoiding fires and carbon monoxide. You shouldn’t seek to take care of this issue without professional help.
  3. A single light is flickering quickly and the other is flashing slowly. This often signifies power polarity has been transposed. Your heating system might have a wiring issue that needs specialized support from Jack's Heating, Cooling, Stoves & Fireplaces.
  4. The duo of lights are blinking slowly. This means your heater’s blower motor likely isn’t running. This piece circulates heated air from the heater into your residence. We can help in determining what’s wrong with this piece.
  5. An individual light is flickering slowly and the other is blinking fast. This signifies your heating system may have insufficient voltage or a short circuit. Contact our specialists at 308-646-3827 for support.
  6. One light is blinking on, on and off while the other flashes on, off, on. This means there may be a malfunction with your HVAC system’s motherboard or wiring. Jack's Heating, Cooling, Stoves & Fireplaces can determine the error and fix it.
  7. Both lights display alternating slow flickers. This means your furnace likely has a flame failure. There could be a problem with its gas supply, gas valve or ignitor control. Reach out to us at 308-646-3827 for support.
  8. One light blinks slowly while the other is steady. This often signifies your heater’s limit switch is experiencing an error. The switch stops your heater from overheating. Call the pros at Jack's Heating, Cooling, Stoves & Fireplaces for support.

Heating System Blower Runs But No Warm Air

Here’s what may be at fault when you notice your heating system’s blower fan working, but you aren’t gaining any heat.

  • The pair of lights are giving alternating quick flashes. This signifies your furnace ignitor might be broken. This part kindles energy in your heater to make warm air and should be fixed by an expert from Jack's Heating, Cooling, Stoves & Fireplaces.

Turn to Us for Professional Furnace Repair

When you have to get your heating system repaired fast, depend on the specialists at Jack's Heating, Cooling, Stoves & Fireplaces. Our technicians will fix the fault quickly and have your house feeling relaxing again in a short time. Reach out to us at 308-646-3827 or contact us online to get an appointment now.

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