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,,
rick

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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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