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Monday, April 22, 2019

Liftmaster Garage Door Safety Sensors

Liftmaster garage door operators have two different styles of photo-electric safety sensors. So which one do you buy when yours stop working? That's going to depend on how old your operator is. You'll either have the older 41A4373A Liftmaster bolt style that bolts through the mounting bracket or the newer 41A5034 Liftmaster "Snappy Sensors" that snap into the mounting bracket.
41A4373A Liftmaster Sensors
41A4373A Sensors (old style)
The 41A4373A Safety Sensors are compatible with Liftmaster operators manufactured from 1993 to 1997. You can tell this is the sensor you need by the bolt that goes through the center of sensor and bolts to the bracket. They're compatible with opener models 1240, 1245, 1246, 1250, 1255, 1256, 1260 and ATS. Compatible with Liftmaster, Sears, Craftsman, Chamberlain and Raynor openers manufactured since 2000.
41A5034 Liftmaster Sensors
41A5034 Sensors (new style)

The newer 41A5034 Snappy Sensors are compatible with Liftmaster operators manufactured from 1997 to current. You can recognize the Snappy Sensors because they snap into the mounting brackets. These sensors work with operator models 1265, 2265, 2280, 2500, 2580 and other current models. Compatible with Liftmaster, Sears, Craftsman and Chamberlain.

As much of a pain the safety sensors are (especially when they're not working) you need to have them. They offer protection from the garage door operator closing on your car, yourself or a loved one. You'll know they're not working if your remote won't close the door and you have to use constant pressure on the wall button to get the door to close. This doesn't mean they're broke it just means they aren't working properly. Before you buy a new set of sensors check and make sure there's nothing blocking the sensors, there's no loose wires and the sensors are "looking" at each other & aren't knocked out of alignment. If you've done that and they still don't work then you'll probably have to get new sensors.

UPDATE: Due to the 41A4373A Sensors (old style) being discontinued we've updated this post

41A5266-3 Liftmaster Sensor Brackets
41A5266-3 Sensor Brackets
If you determine that you have the 41A4373A Sensors (old style) then you can go with the option of using the 41A5034 Sensors (new style) but you'll also need to use the 41A5266-3 Safety Sensor Mounting Brackets since the sensors mount differently from the old 41A4373A Sensors.

You can purchase the newer 41A5034 Sensors here and the 41A5266-3 Sensor Brackets here at the Garage Door Zone.



wilson25177 said...

The green light on one sensor is illuminated. It is not on the other. Is there a way of testing these sensors (before purchasing them) to ensure they are bad. My garage door will open with the remotes but will not close.

Brian said...

You could remove the sensors from their brackets (but leave the wires connected) and put the lenses of each sensor up against the other so they are "looking" at each other and are basically touching. Try the opener - if it still refuses to close then you've eliminated the possibility that they were out of alignment and one of the sensors has probably gone bad.

Steven Owen said...

I have a question about the garage door sensors. My garage door wouldn't close without overriding it. I noticed the green lights not working on the sensors. I realigned them and still nothing. I just bought two new ones and replaced them. Still no light. I checked for shorts and found none.
So would something be out on the opener itself? Or what?
Thank you in advance.

Brian said...

Steven - it sounds like you're on the right track. You may want to check the connections on the back of the powerhead & make sure they are correct and haven't come loose. You may also want to try running new 2-strand wire to the sensors and see if that works (just in case a staple is pinching one of the wires). If it still doesn't work then you most likely have a problem with the logic board and it will need to be replaced.

jenn said...

My door will not close without overriding it with wall control. Both of my sensor LEDs are illuminated- one is green one is yellow. Breaking the beam with my hand shuts off the green LED. Does the yellow LED indicate a problem?

Brian said...

It's possible the down force sensitivity may need to be adjusted. If you have a Liftmaster (Craftsman/Sears/MasterMechanic/some Raynor openers) then you should check the Diagnostic Light on the back of the powerhead. The small LED light will blink when there's a problem...count the number of times the LED light blinks & this will help you narrow down what the problem is.