Chamberlain Liftmaster 41A4373A Safety Sensors

These are great for replacements on my system... make sure they look like your old ones and you won't be disappointed. Pretty easy to install or replace also. Note that Chamberlain made some of the Sears Craftsman units in the past I believe.

This was an exact replacement for an older 1/2 HP Liftmaster dated Aug,1995 (08/95). Called the local garage repair & the tech tried to convince me to buy a new opener @ $650 which quickly dropped to $500. I sized him up, said "no thanks" and blocked his number on my phone. I found this replacement sensor pair & decided to give it a try @ $50.00 I tried to get away with just replacing the receiving unit but it just erratically blinked (no steady light). When I replaced the paired sending unit & plugged in the opener, it worked just like it was new. It was a little frustrating connecting the wires to the new units but it probably had more to do with the cold weather. I will tidy up the wiring & clean up when it warms up but I have a functioning garage door opener with about 45 minutes of labor.

I had to buy 2 sets of these sensors to replace ones that were manufactured in December 1996 and which began to operate very sporadically, especially when the temperature dropped below freezing. The behavior was that, sporadically, the green light on the receiving sensor would turn off, and then when I tried to close the door, the door would move for just a few inches and then bounce back up and the garage opener light would flash 10 times, which indicates a sensor issue. The failed sensors, identical to this product I purchased, worked flawlessly for about 28 years, which I suppose is reasonable, so I don't mind buying the same product again. Unfortunately, no matter where you buy these nowadays, they will be much more expensive than replacement sensors for more modern garage openers, perhaps because this model of sensor is so old that there are not many companies (maybe only Liftmaster itself?) producing them anymore, and therefore, minimal price competition. Still, these replacement sensors are cheaper than a whole new garage door opener unit which includes new sensors. So if your garage door opener motor is still working fine, but your sensors are not, then it could be worth the investment to just replace the sensors.

These sensors were easy to install. They give you an extra connector which it turns out I needed as it was not clear from the instructions that you really have to shove the wires all the way into the connector and hold them firm while you crimp them. So the first time I crimped the connector the wire did not connect. These crimp type connectors are only able to be crimped once. So use caution when you crimp the wires. The sensor seemed to have solved my problem with the old receiver that it would not work in the cold. It has been cold a couple of times since I got the new ones and there have been no problems. I would have given a 5 star rating but I don't know how long these new sensors will last. The old ones lasted 25 years. If these new ones last that long I will give them a 6 star rating.

Worked perfectly and still do years later

A perfect replacement for my Sears opener safety sensors. Instructions for the curious: Came with an extra connector even - don't know if they always do that, but made me feel safer should I mis-squeeze one of them (get them right, you don't get a second chance). I had both the existing units replaced in less than 10 minutes. Very easy to replace - Do not strip the wires - 1) Unplug your opener itself from the power outlet. 2) Install new unit and aim across to other one and tighten, 3) stretch out wire along old wire present. 4) Cut old wire with about 6" overlap from new wire - to be sure you have working room. 5) separate the wires from each other for about 2 to 3 inches along both wire sets. 6) insert the wires into the connectors, making sure you insert Black striped wire from opener with black striped wire from unit - and plain wire with plain wire for each unit. 7) Holding the wires fully into the connectors - squeeze the round part into the connector with a pliers - they will connect the two wires, going through the wire insulation themselves and electrically connecting the two inserted wires. 8) Plug your opener back into the wall outlet - you are done. Try your opener...

Just like everyone else says, it was fast, easy and inexpensive vs. having a handyman or professional garage door man do it. I[...] Installing I had a little trouble with the splicing mechanism, but it was my own fault for taking it apart and trying to figure it out. Just strip about 1/8 inch of insulation off the wires and stick them in splice connector and crimp down with a pair of pliers (I'm not even sure you really need to strip the insulation. It looks to me like the splcing mechanism would cut right through it). I also lost a little time because I had disassembled the bracket holding the old sensor and I had to put that back together. Nevertheless my total installation time for both the sending and receiving sensors plus testing the door a few times was 40 minutes. Installation Tip: The receiving sensor light only comes on when it is receiving from the sending sensor. Sounds obvious, but it was disconcerting to me that the light didn't come on when I first wired it. [...] Although I do think the Sears part would install in half the time because the wire from the old sensor had a plug that would unplug from the old sensor and plug straight into the new one. No splicing required.

The replacement part look like the original. Then, it was easy to install and it work well.

This is a perfect replacement of the one that I used to have. Now I do not have the problem of the door not opening when it is cold or doing a lot of programming that I used to do with the old one. For the price, which is $20 less when I buy it locally, I would recommend this product. Make sure though that when you buy this product that it matches the year of the opener. Mine is 1993 and it works fine.

Perfect replacement for my 27 year old originals. If available, would have replaced the rusty old mounting hardware as well.

Exactement comme celui à remplacer, tant qu'à être là j'ai changé les 2 et ce facilement, opèrent parfaitement.

One of my photo eyes on the overhead door had been damaged, the local replacement parts were more expensive, these ones came within a few days and it was easy to replace my existing ones. Thank you for the good service!