Troubleshooting Photo Eyes on a LiftMaster Operator - DDM Garage Doors Blog

Posted October 2nd, 2020 at 5:36 pm by Dan Musick

Photo eyes keep garage doors from injuring people. They detect objects that would obstruct the door as it closes. However, a malfunctioning photo eye may keep the door from closing at all.

Often when a garage door will open but not close, the cause is a misaligned eye or a broken wire. On residential doors with LiftMaster openers, the quickest test is to check the photo eyes on both sides. If both lights are on, the eyes should be in working order. Sometimes, however, one eye will flicker, and the eye will need to be realigned.

Functioning photo eye on a commercial sectional door with a LiftMaster operator.
Functioning photo eye on a commercial sectional door with a LiftMaster operator.

There is another way for you to troubleshoot photo eyes on a LiftMaster Operator. You can do this by checking the lights on the control board, as explained in the video below.

On the operator’s control board, the light marked LMEP will start flashing if the photo eyes are malfunctioning or disconnected. This is the simplest way to troubleshoot photo eyes.

For a simple solution to sun-related photo eye malfunctions, see this post. Other possible solutions include realigning the eyes or fixing broken wires. If the eye continues to malfunction, you may need to replace it.

We also have a blog post with instructions on how to install Omron Photo Eyes.

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2 Responses to “Troubleshooting Photo Eyes on a LiftMaster Operator”

  1. Dale Thompson Says:

    Can you put photo sensors on a Liftmaster h501l3l overhead door

  2. Caleb Penney Says:

    Hello Dale, thank you for that question! Yes, you should be able to put photo eyes on that operator. However, since that opener is no longer supported by LiftMaster, it is difficult to get parts and advice on what the proper replacement is.

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