What Does LiftMaster Error Code 4-6 Mean? Here’s How To Fix It.

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If you’re receiving a 4-6 error code on your LiftMaster garage door, you might be wondering what it means. Fortunately, we have this handy guide for you to understand your garage door opener’s 4-6 error code and find a solution to it.

The Benefits of Self Diagnostics

Usually, it can be quite difficult to diagnose what’s going on with your garage door opener. There are no obvious error messages or displays that can show you what is going on in simple terms. But that’s why manufacturers include self-diagnostic capabilities. As a result, your garage door opener’s onboard controller can flash its lights in a sequence that points towards a particular problem that needs fixing.

Certain garage door openers from LiftMaster and Chamberlain have adjustment arrows marked UP and DOWN. These flash in specific patterns to indicate a problem.

LiftMaster Error Code 4-6

If you’re receiving error codes 4-6, you’re seeing four flashes of the UP button and six flashes of the DOWN button. This error code happens once you try to close your garage door opener. So what’s wrong? It has to do with your safety sensors.

The purpose of your safety sensors is to ensure that nothing is in the way of the garage door while it closes. They’re required by law and prevent injury and damage to your property. Of course, your garage door system will not work correctly without them.

Here are some of the possible things that can go wrong with your garage door safety sensors:

  • Not installed. First, check for a pair of small sensors on either side of your garage door, about six inches off the ground. If you don’t have one or both of them, you might need to install a replacement.
  • Installed incorrectly. Are your sensors wired into the garage door opener? Check to ensure the wires are securely connected to both the sensors and the opener. You can also check for any breaks or damage to the wire.
  • Installed in reverse. Check that each safety sensor wire (black and white) is connected to the correct respective terminals on the opener.
  • Obstructed sensor. If your safety sensors are working correctly, check to make sure nothing is blocking either one of the sensors. Sometimes, dust and debris can cause problems; try cleaning the sensors.
  • Misaligned sensors. The sensors need to be in alignment to work correctly. Check if the receiving sensor has a solid green light, which indicates proper alignment.


We hope this post helps you diagnose your LiftMaster error code 4-6 and rectify the problem with your garage door safety sensors. If you couldn’t solve the problem, though, contact a licensed professional for assistance.

Garage Door Doctor is your local, family-owned-and-operated installation and repair provider for garage doors and garage door openers. We offer quality work for an honest, fair price. Also, we have over 75 years of combined experience in the business. On top of that, we’re fully insured for your protection. So, if your garage door is giving you trouble or you need help programming your garage door opener, call us at (281) 855-9300. We’ll be right on our way!