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

December 06, 2019

While your Lennox® heater cannot speak to you, it possesses a process to communicate a furnace error.

Its motherboard has a set of LED lights that can share a fault code. Subject to the issue, your heater might show continuous or flashing lights.

While there are various basic HVAC fixes you can complete on your own, many services are best left to the professionals. When your furnace will not turn on or put out warmth, call West Jefferson Plumbing and Heating, Inc. at 614-879-9091 for experienced furnace repair in West Jefferson.

Our specialists will speedily pinpoint and take care of the issue, even if you don’t have a Lennox heating system. We can repair any kinds or configuration—and get the heat reintroduced to your residence fast.


What Does the Blinking Light on My Furnace Mean?

Your heating system depends on lights to flash code when it needs to be repaired. It also uses this system to tell you it’s heating like it should.

Regular function involves:

  • Simultaneous slow flash—heater operating properly.
  • Simultaneous fast flash—furnace is starting to call for heat.

If you notice one light going on and off slowly and the other flashing quickly, your heating system might be having a low flame signal. This can take place even when your furnace is running like it should. It means the flame sensing rod may have build-up or in the incorrect area on the burner. Contact us at 614-879-9091 for assistance.

Here are some of the most routine errors for Lennox furnaces.

Furnace Will Not Start

Here are many of the light patterns you may observe when your heating system refuses to or stay on. The majority of these issues need to be taken care of by an expert, for instance from West Jefferson Plumbing and Heating, Inc..

  1. Both LED lights are off. This means your HVAC system might not have power. Go to the breaker box to make sure the furnace fuse has not triggered. Try resetting the fuse if it has moved into the “off” area. If it immediately flips after you reset it, don’t touch the breaker and get in touch with us us at 614-879-9091.
  2. One light is unchanging and the other is flickering slowly. This means the flame rollout switch is likely open. The component is a critical safety guard that helps in preventing fires and carbon monoxide. You shouldn’t seek to take care of this fault on your own.
  3. A single light is flashing rapidly and the other is flickering slowly. This typically indicates power polarity has been reversed. Your heating system could have a wiring problem that calls for expert help from West Jefferson Plumbing and Heating, Inc..
  4. Both lights are flickering slowly. This signifies your heater’s blower motor likely isn’t working. This component distributes heated air from the HVAC system into your home. We can help in figuring out what’s wrong with this piece.
  5. A single light is flickering slowly and the other is flickering rapidly. This signifies your heating system might have insufficient voltage or a short circuit. Get in touch with our professionals at 614-879-9091 for help.
  6. One light is flashing on, on and off while the other flickers on, off, on. This means there could be trouble with your furnace’s control panel or wiring. West Jefferson Plumbing and Heating, Inc. can determine the error and handle it.
  7. The pair of lights show every other slow flickers. This signifies your heater possibly has a flame issue. There could be an issue with its gas supply, gas valve or ignitor control. Reach out to us at 614-879-9091 for assistance.
  8. One light flashes slowly while the other stays solid. This typically signifies your heater’s limit switch is experiencing an error. The switch stops your heating system from getting too hot. Contact the specialists at West Jefferson Plumbing and Heating, Inc. for support.

Furnace Blower Works But No Heat

Here’s what might be at fault when you notice your furnace’s blower fan on, but you aren’t gaining any heat.

  • The duo of lights display alternating rapid flashes. This signifies your furnace ignitor could not be working. This part ignites gas in your heater to create warmth and should be fixed by a specialist from West Jefferson Plumbing and Heating, Inc..

Trust Us for Expert Furnace Repair

When you have to get your HVAC equipment fixed without delay, trust the technicians at West Jefferson Plumbing and Heating, Inc.. Our pros will handle the problem quickly and have your home feeling comfortable again soon. Get in touch with us at 614-879-9091 or contact us online to schedule an appointment now.