Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Door ups and downs

I jsut had to replace my ground sensors and i dont know how that could have interfered with a door that had been working fine for 2 plus years. but after installing the new sensors the door goes up but when you press down the light starts blinking and if you let off the button it stops and starts going back up. if you hold the button down it will go down but you have to hold it to the bottom.

thanks in advance,,

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  • 18 Answers

Holding the button down just bypasses the sensors.
Your sensors are not adjusting correctly, or there is a short in the wires.
The back of the machine has a little yellow light, count the flashes and corelate it to the troubleshooting portion of the manual to confirm.

The orange light is a constant, the green sensor needs to be adjusted until you get a solid green light.

Posted on Feb 13, 2009

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Yes ,your path may be clear and you might have two indicator lights lit,but remember that theese sensors are called a sender and a reciever,the sender send,s a signal to the reciever to let it know that alls clear and their are no obsructions , but i can tell you from experience that if your sensor has the slightest fliker it will not allow the door to come down as a safety feature that was incorporated in all machines by law from 13 years ago, First thing you want to do is find out which sensor is the reciever and this is very easy ,Just put your hand in front of one of the camera,s ....The one sensor that,s light goes out is the receiver, Thats because it is not receiving a signal ! Now I want you to make shure it is straight in it,s holder,aiming directly accross from the other sensor! Next go to the sender ,This beam is the crucial one and must be directly pointed at the reciever, notice the light on the sensor it is always solid and will not go out ,Next i want you to go back to the reciever and loosen up the wingnut that holds the sensor in the bracket , as you move the sensor up to down and left to right notice the light on the receiver become dim and bright and flicker as you move it from the direct path of the sender , this is exactly what i want you to adjust to it,s brightest light possible , after you have tightened it back up go over to the wallpad or doorbell that operates the door and see if your problem has now dissapeared , Thank you for letting me try to help you and hopefully we fixed together Sincerely Glenn Mayer

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