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How do I stop my garage roller door from opening back up again as soon as I?

When I click the door to close it rolls down and then immediately opens up again?
margaret Atkinson from OZ, May 2011
If your door is an up and over couterbalance then the door requires added weight to the counterbalance

If it is an up and over spring loaded door then the spring requires tightening up with Allan Keys

The same procedure required for a wire loaded roller use Allan Keys to tighten wire

Gordon, February 2012