Furnace troubleshooting

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

While your Lennox® heater can’t talk to you, it does have a method to communicate a furnace error.

Its control panel has a set of LED lights that can share a fault code. Depending on the failure, your furnace might display continuous or flashing lights.

Though there are a few elementary HVAC repairs you can complete yourself, the majority of repairs are best taken care of by experts. When your heating system will not turn on or give warmth, get in touch with Gillman Heating and Air at 478-202-3076 for professional furnace repair in Perry.

Our specialists will rapidly discover and take care of the problem, even if you don’t use a Lennox heating system. We can repair whichever types or configuration—and get the heat reintroduced to your residence quickly.


What Does the Flashing Light on My Heater Mean?

Your furnace relies on lights to flash code when it requires repairs. It also engages this system to tell you it’s operating correctly.

Normal operation involves:

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

If you see a lone light flashing slowly and the other blinking rapidly, your heating system might be having a low flame signal. This can occur even when your furnace is heating properly. It signifies the flame sensing rod could need to be cleaned or in the bad area on the burner. Call us at 478-202-3076 for assistance.

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

Heater Refuses to Start

Here are some of the light patterns you may notice when your furnace refuses to or keep heating. The bulk of these errors need to be taken care of by an expert, for instance from Gillman Heating and Air.

  1. Both LED lights are off. This indicates your heater might not have electricity. Examine the breaker box to confirm the heater fuse has not triggered. Try resetting the fuse if it’s in the “off” position. If it immediately trips following a reset, don’t try to reset it again and get in touch with us us at 478-202-3076.
  2. An individual light is stable and the other is blinking slowly. This means the flame rollout switch is probably malfunctioning. The switch is an important safety guard that aids in stopping fires and carbon monoxide. You shouldn’t attempt to fix this fault yourself.
  3. A single light is flashing fast and the other is flickering slowly. This likely signifies power polarity has been inverted. Your heater might have a wiring fault that needs specialized aid from Gillman Heating and Air.
  4. The duo of lights are flickering slowly. This indicates your furnace’s blower motor possibly isn’t operating. This piece moves warm air from the HVAC system into your residence. We can assist in figuring out what’s causing an issue with this component.
  5. A single light is flickering slowly and the other is flickering quickly. This signifies your heating system may have insufficient voltage or a short circuit. Reach out to our specialists at 478-202-3076 for support.
  6. One light is blinking on, on and off while the other flashes on, off, on. This indicates there might be an issue with your HVAC system’s control board or wiring. Gillman Heating and Air can determine the fault and take care of it.
  7. The pair of lights show alternate slow flashes. This means your heater likely has a flame error. There could be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 478-202-3076 for assistance.
  8. A single light blinks slowly while the other stays solid. This often indicates your furnace’s limit switch is open. The switch keeps your furnace from becoming too warm. Reach out to the experts at Gillman Heating and Air for support.

Furnace Blower Operates But No Warm Air

Here’s what may be at fault when you hear your heating system’s blower fan on, but you aren’t receiving any warmth.

  • The duo of lights display alternating fast flickers. This signifies your furnace ignitor might be broken. This part lights energy in your heating system to make warmth and should be fixed by a technician from Gillman Heating and Air.

Depend on Us for Professional Furnace Repair

When you need to get your HVAC equipment fixed quickly, trust the professionals at Gillman Heating and Air. Our techs will take care of the problem quickly and have your rooms feeling comfortable again in a short time. Get in touch with us at 478-202-3076 or contact us online to schedule an appointment right away.

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