Furnace troubleshooting

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

While your Lennox® heating system isn’t able to speak to you, it does have a way to communicate a furnace error.

Its motherboard has twin LED lights that can share a fault code. Subject to the fault, your furnace could display solid or flashing lights.

While there are various basic furnace repairs you can finish yourself, many services are best taken care of by the professionals. When your heater will not start or deliver warmth, call House of Heating Incorporated at 888-384-3163 for experienced furnace repair in Marshfield.

Our specialists will rapidly detect and fix the issue, even if you don’t use a Lennox heater. We can fix any brands or models—and get the heat reintroduced to your residence fast.


What Does the Flashing Light on My Heating System Mean?

Your heater depends on lights to flash code when it is malfunctioning. It also engages this system to tell you it’s working like it should.

Correct function consists of:

  • Simultaneous slow flash—heating system working correctly.
  • Both lights flash fast—furnace is initiating the call for heat.

If you realize that a single light flashing slowly and the other going on and off rapidly, your heating system could be experiencing a low flame signal. This can take place even when your furnace is heating correctly. It signifies the flame sensing rod could have build-up or in the bad spot on the burner. Contact us at 888-384-3163 for support.

Here are several other of the most typical problems for Lennox HVAC systems.

Furnace Won’t Turn On

Here are many of the light patterns you may see when your heating system refuses to or stay on. The bulk of these issues have to be handled by a specialist, like one from House of Heating Incorporated.

  1. The duo of LED lights are extinguished. This indicates your heater might not be receiving power. Look at the breaker box to confirm the heater fuse hasn’t flipped. Try resetting the fuse if it’s in the “off” position. If it immediately turns off after you reset it, leave the breaker alone and call us at 888-384-3163.
  2. One light is stable and the other is flickering slowly. This means the flame rollout switch is likely malfunctioning. The switch is an essential safety guard that assists in avoiding fires and carbon monoxide. You shouldn’t attempt to fix this issue yourself.
  3. A single light is flickering quickly and the other is flashing slowly. This typically indicates power polarity has been inverted. Your furnace might have a wiring fault that needs professional aid from House of Heating Incorporated.
  4. All lights are flashing slowly. This indicates your heating system’s blower motor probably isn’t operating. This part circulates hot air from the heater into your rooms. We can aid in pinpointing what’s wrong with this component.
  5. A single light is blinking slowly and the other is blinking quickly. This indicates your heater could have not enough voltage or a short circuit. Contact our experts at 888-384-3163 for support.
  6. One light is flashing on, on and off while the other flashes on, off, on. This signifies there could be an issue with your heating system’s control board or wiring. House of Heating Incorporated can find the problem and handle it.
  7. Both lights are using alternating slow flickers. This signifies your HVAC system possibly has a flame error. There might be trouble with its gas supply, gas valve or ignitor control. Call us at 888-384-3163 for support.
  8. An individual light blinks slowly while the other stays steady. This typically means your heater’s limit switch is not working. The switch keeps your heating system from becoming too warm. Call the pros at House of Heating Incorporated for support.

Heating System Blower Operates But No Warmth

Here’s what could be at fault when you hear your furnace’s blower fan on, but you aren’t gaining any warm air.

  • The pair of lights display alternate rapid flickers. This indicates your furnace ignitor could not be in working order. This piece lights energy in your heating system to create warmth and should be fixed by a technician from House of Heating Incorporated.

Depend on Us for Expert Furnace Repair

When you need to have your furnace repaired fast, trust the technicians at House of Heating Incorporated. Our pros will repair the issue without delay and have your space feeling comfortable again soon. Get in touch with us at 888-384-3163 or contact us online to schedule an appointment right away.

Back To Blog