Belt Noise for Chamberlain HD600 1/2 HP Whisper Drive Garage Door Opener

You have to adjust the safety pressure sensor. It is set to too light a pressure. Check your manual for the adjustment.

https://www.homedepot.com/catalog/pdfimages/5f/5fd2aeb5-b2a0-4985-b9c0-c19df6bc0e55.pdf page 37-38

Hi. I have seen this before, although usually not from chamberlain garage door openers.

Pull the release cord that unlocks the door from the opener, and manually open the door ALL the way open.

Then lock back in place in the open position.

Then use automatic opener to shut door.

It will close very slowly, but should close all the way.

Then, open the door again using the remote, and the door will once again open slowly, this time it should open all the way.

Then close door with remote, and door should now close as it is supposed, with the proper speed.

The slow opening and shutting is the system position sensor resetting itself.

This is why your door is acting up.

I would also look up by the belt drive connects to the front of the garage door opening, to make sure there isn't any dirt, cobwebs, or other obstructions on the sensor that may cause it to re-close the way it does.

SOUNDS LIKE THE UP LIMIT IS EITHER OUT OF ADJUSTMENT OR NOT WORKING.

TURN IT ABOUT THREE TURNS COUNTER CLOCKWISE. THIS SHOULD BE ENOUGH TO MAKE IT NOT OPEN ALL THE WAY. THEN ADJUST IT 1/2 TURN AT A TIME THE OTHER WAY UNTIL IT GETS CLOSE THEN SMALLER ADJUSTMENTS TILL YOU ARE HAPPY WITH WHERE IT STOPS.

HOPE THIS HELPS

If the wall button will operate the door up but none of the devices do then look at the wall button. Find the lock button and push it for 2 seconds and then try the remotes again. This is your vacation lock. You can get a manual at chamberlain.com. Now if the door does not open or close with the remotes you can reprogram them. Press the colored learn button on the motor head and then press the button on the remote. Repeat for each remote. If they fail to program you will need a new logic board. Thanks BB

The opener is having a hard time operating the door. It sounds like the door is out of balance. The door should stay all the way up at half down and all the way down. You should be able to raise and lower the door by hand EASILY. The opener is only meant to lift10-15 lbs. Thanks BB

DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

door does not close without holding wall button in