Furnace troubleshooting

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

While your Lennox® HVAC equipment can’t talk to you, it possesses a way to get your attention when there’s a furnace error.

Its control panel has two LED lights that can display a fault code. Subject to the problem, your heater might use continuous or flashing lights.

Though there are some simple heating adjustments you can take care of yourself, most tasks are best handled by HVAC technicians. When your heater refuses to start or give warm air, get in touch with Gee & Missler Heating & Air Conditioning at 734-363-8907 for skilled furnace repair in Wyandotte.

Our experts will speedily discover and fix the malfunction, even if you don’t own a Lennox heater. We can repair all brands or models—and get the warmth returned to your house without delay.


What Does the Flashing Light on My Heating System Mean?

Your heater relies on lights to flash code when it isn’t working right. It also engages this system to let you know it’s running correctly.

Correct heating consists of:

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

If you realize that a solitary light flashing slowly and the other blinking rapidly, your heating system could be experiencing a low flame signal. This can take place even when your heating system is working properly. It means the flame sensing rod may be dirty or in the bad spot on the burner. Reach out to us at 734-363-8907 for support.

Here are several other of the most common issues for Lennox heating systems.

Heater Won’t Kick On

Here are many of the light sequences you could notice when your heating system refuses to or keep heating. The bulk of these problems have to be fixed by a specialist, like one from Gee & Missler Heating & Air Conditioning.

  1. The pair of LED lights aren’t lit. This means your heater might not have power. Examine the breaker box to confirm the heater fuse is not tripped. Try resetting the fuse if it’s in the “off” spot. If it immediately turns off following a reset, don’t touch the breaker and call us at 734-363-8907.
  2. One light is solid and the other is flashing slowly. This implies the flame rollout switch is likely malfunctioning. The part is an important safety guard that helps in avoiding fires and carbon monoxide. You shouldn’t try to fix this issue on your own.
  3. A single light is flashing fast and the other is flashing slowly. This often indicates power polarity has been reversed. Your heater might have a wiring error that requires specialized help from Gee & Missler Heating & Air Conditioning.
  4. Both lights are flickering slowly. This signifies your furnace’s blower motor likely isn’t working. This component distributes warm air from the heating system into your house. We can help in pinpointing what’s causing a problem with this piece.
  5. One light is flickering slowly and the other is blinking quickly. This means your heater could have not enough voltage or a short circuit. Call our specialists at 734-363-8907 for help.
  6. One light is flashing on, on and off while the other flashes on, off, on. This signifies there may be an issue with your HVAC system’s control board or wiring. Gee & Missler Heating & Air Conditioning can locate the problem and handle it.
  7. The duo of lights show alternating slow blinks. This means your heating system may have a flame error. There could be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 734-363-8907 for assistance.
  8. An individual light flashes slowly while the other remains steady. This typically means your HVAC system’s limit switch is open. The switch stops your heating system from overheating. Reach out to the experts at Gee & Missler Heating & Air Conditioning for help.

Furnace Blower Operates But No Warm Air

Here’s what might be broken when you hear your heating equipment’s blower fan working, but you aren’t receiving any heat.

  • The pair of lights display alternating quick flashes. This means your furnace ignitor might not be in working order. This piece kindles gas in your heating system to produce warmth and should be serviced by a professional from Gee & Missler Heating & Air Conditioning.

Depend on Us for Professional Furnace Repair

When you have to get your heating system in working order quickly, depend on the specialists at Gee & Missler Heating & Air Conditioning. Our technicians will repair the issue right away and have your house feeling comfortable again in no time. Call us at 734-363-8907 or contact us online to request an appointment today.

Back To Blog