Chamberlain Liftmaster 41A4373A Safety Sensors

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 @ $50.00I 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.

Fortunately, I was able to locate this replacement part on the seller`s site. Our +17 year old sensor stopped working as soon as the temperature dropped below 0 Celsius (32 Fahrenheit). The receiving eye`s green LED would go blank and attempts to close the garage door would cause it to pop open. As an interim solution we had to open the door, drive out, and then run back into the garage to close the garage door by pressing and holding down the main door button.Recommended extra tools:Small wire cutter/stripperPliersInstructions were relatively simple, but you need to remember BOTH sensors must be replaced otherwise the system will not work. Look on the tail end of the sensors to see the identifying label.Below is what I encountered:I am not sure why Chamberlain/Liftmaster changed the product, but the original sensors used easily detachable plugs where the sensors had the receiving female end and the wall wire had the male plug. These newer replacement sensors only use wires. The wires coming from the wall have plugs that must be cut off and then spliced onto the new sensors' wire (Note: Follow the package's instructions and unplug the garage motor first). You don't want to strip down the wires too deeply in order to avoid having exposed copper wire remaining outside of the connector. When you put the wire into the connector take a look at the top of the connector to see how deep the copper wiring has gone.Troubleshooting experiences:I changed the Receiving Eye sensor only, but the system still did not work. This is when I discovered that you need to change both the Sending and Receiving sensor.My clumsiness or numbness from the cold may have cut too deeply into the copper wiring. After successfully installing and testing the garage door I tried to tape down the wiring. This caused the LED lights to lose connection, but after fiddling with the wires I realized that my I may have cut too deeply into the wires. I did a temporary fix by jiggling the wires until it worked again, then used electrical tape to keep squeezing the wires together in that position.Maybe when the weather warms up (or if my wires loosen again) I will re-do the wiring, but I ran out of those Wire connectors.Otherwise - this replacement part works as expected.Thanks

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.

This worked great on my pre 1999 sears garage door opener. Easy install.

The hurricanes took out our garage door sensors and even if we could have gotten on the garage door installers calendar, they wanted $300.00 to replace the sensors that had gotten wet in the flood. We easily replaced the damaged ones for less than a hundred dollars and they work great. So appreciative the seller made sure we got this order even when mail was a mess.