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

December 06, 2019

While your Lennox® HVAC equipment cannot talk to you, it possesses a procedure to communicate a furnace error.

Its control board has two LED lights that can share a fault code. Subject to the issue, your furnace might show steady or flashing lights.

Although there are certain basic furnace fixes you can take care of on your own, most tasks are best taken care of by experts. When your furnace refuses to start or give warmth, contact House of Heating Incorporated at 715-384-3163 for skilled furnace repair in Marshfield.

Our specialists will swiftly spot and fix the breakdown, even if you don’t use a Lennox heating system. We can fix whichever types or makes—and get the warmth reintroduced to your house without delay.


What Does the Flashing Light on My Heating System Mean?

Your heating system depends on lights to flash code when it is malfunctioning. It also uses this setup to relay it’s operating correctly.

Correct operation includes:

  • Concurrent slow flash—furnace running like it should.
  • Concurrent fast flash—furnace is beginning to call for heat.

If you see one light going on and off slowly and the other going on and off rapidly, your heating system might have a low flame signal. This can happen even when your furnace is heating properly. It indicates the flame sensing rod could be dirty or in the incorrect spot on the burner. Reach out to us at 715-384-3163 for assistance.

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

Heater Will Not Turn On

Here are a few of the light sequences you could notice when your furnace will not or keep operating. The bulk of these errors have to be taken care of by a technician, such as one from House of Heating Incorporated.

  1. Both LED lights are extinguished. This means your heater might not have electricity. Check the breaker box to confirm the furnace fuse is not flipped. You should reset the fuse if it has moved into the “off” spot. If it instantly turns off after a subsequent reset, don’t touch the breaker and call us at 715-384-3163.
  2. An individual light is solid and the other is flickering slowly. This signifies the flame rollout switch is possibly open. The component is an important safety device that helps in avoiding fires and carbon monoxide. You shouldn’t seek to take care of this issue without professional help.
  3. An individual light is flashing quickly and the other is flickering slowly. This often indicates power polarity has been inverted. Your heating system could have a wiring fault that requires professional support from House of Heating Incorporated.
  4. Both lights are flashing slowly. This indicates your furnace’s blower motor possibly isn’t running. This piece circulates heated air from the heating system into your house. We can assist in pinpointing what’s causing a problem with this part.
  5. A single light is flickering slowly and the other is blinking quickly. This signifies your heater might have insufficient voltage or a short circuit. Reach out to our specialists at 715-384-3163 for support.
  6. One light is blinking on, on and off while the other blinks on, off, on. This signifies there might be a problem with your heater’s control board or wiring. House of Heating Incorporated can locate the error and fix it.
  7. The pair of lights display every other slow flickers. This signifies your heating system possibly has a flame issue. There could be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 715-384-3163 for support.
  8. One light flashes slowly while the other remains continuous. This typically indicates your HVAC equipment’s limit switch is experiencing an error. The switch keeps your heater from getting too hot. Call the experts at House of Heating Incorporated for assistance.

Furnace Blower Runs But No Heat

Here’s what might be wrong when you hear your heating system’s blower fan running, but you aren’t getting any heated air.

  • The pair of lights are giving alternate quick blinks. This indicates your furnace ignitor could be broken. This component kindles gas in your heating system to make heat and should be serviced by a professional from House of Heating Incorporated.

Turn to Us for Professional Furnace Repair

When you have to have your heating system fixed without delay, trust the professionals at House of Heating Incorporated. Our pros will handle the problem right away and have your space feeling comfortable again in a short time. Reach out to us at 715-384-3163 or contact us online to get an appointment today.