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

December 06, 2019

While your Lennox® heater cannot talk to you, it does have a method to tell you about a furnace error.

Its motherboard has twin LED lights that can display a fault code. Based on the failure, your heating system might display solid or flashing lights.

Although there are a few elementary furnace repairs you can take care of without an expert, the majority of fixes are best left to HVAC technicians. When your heater will not start or provide warm air, reach out to Gee & Missler Heating & Air Conditioning at 734-284-1224 for expert furnace repair in Wyandotte.

Our technicians will speedily detect and handle the problem, even if you don’t have a Lennox furnace. We can repair all kinds or makes—and get the warmth reintroduced to your house quickly.


What Does the Flashing Light on My Heater Mean?

Your heater depends on lights to flash code when it is malfunctioning. It also uses these lights to relay it’s running correctly.

Normal heating includes:

  • Both lights flash slowly—heater running correctly.
  • Simultaneous fast flash—heating system is beginning to call for heat.

If you realize that a lone light blinking slowly and the other going on and off fast, your heater might have a low flame signal. This can happen even when your heating system is operating correctly. It signifies the flame sensing rod could have build-up or in the incorrect spot on the burner. Reach out to us at 734-284-1224 for support.

Here are a few other of the most routine faults for Lennox HVAC systems.

Heater Won’t Start

Here are a few of the light patterns you could observe when your heater refuses to or keep running. The majority of these problems must be fixed by an expert, such as one from Gee & Missler Heating & Air Conditioning.

  1. All LED lights are extinguished. This signifies your heater might not be receiving power. Go to the breaker box to make sure the heating system fuse is not flipped. You should reset the fuse if it is in the “off” position. If it immediately flips following a reset, leave the breaker alone and call us at 734-284-1224.
  2. A single light is solid and the other is flickering slowly. This implies the flame rollout switch is may be not working right. The component is an important safety device that assists in stopping fires and carbon monoxide. You shouldn’t attempt to repair this problem without professional help.
  3. A single light is flickering quickly and the other is flashing slowly. This often signifies power polarity has been inverted. Your furnace may have a wiring fault that needs professional aid from Gee & Missler Heating & Air Conditioning.
  4. Both lights are blinking slowly. This means your furnace’s blower motor probably isn’t operating. This piece circulates heated air from the heating system into your space. We can help in determining what’s causing a problem with this piece.
  5. An individual light is blinking slowly and the other is blinking fast. This signifies your furnace may have insufficient voltage or a short circuit. Get in touch with our professionals at 734-284-1224 for assistance.
  6. One light is flickering on, on and off while the other flashes on, off, on. This indicates there might be a problem with your heater’s control panel or wiring. Gee & Missler Heating & Air Conditioning can locate the problem and fix it.
  7. Both lights are using every other slow flashes. This means your HVAC system possibly has a flame failure. There might be a problem with its gas supply, gas valve or ignitor control. Call us at 734-284-1224 for help.
  8. An individual light flashes slowly while the other stays steady. This typically signifies your furnace’s limit switch is experiencing an error. The switch stops your HVAC system from overheating. Get in touch with the pros at Gee & Missler Heating & Air Conditioning for support.

Furnace Blower Runs But No Warmth

Here’s what might be at fault when you notice your furnace’s blower fan working, but you aren’t receiving any warmth.

  • The pair of lights are showing alternating quick flashes. This means your furnace ignitor may not be in working order. This piece lights fuel in your furnace to create heat and should be serviced by a technician from Gee & Missler Heating & Air Conditioning.

Trust Us for Skilled Furnace Repair

When you need to get your furnace repaired quickly, depend on the technicians at Gee & Missler Heating & Air Conditioning. Our techs will repair the issue quickly and have your house feeling cozy again in no time. Reach out to us at 734-284-1224 or contact us online to get an appointment today.