emergency disconnect

door opens then trips emergency disconnect and door slams shut how can I correct this? it does not happen but once every 4-5 times

Check for a broken spring! The door should not slam shut even when disconnected. If there is no broken spring they need adjusted. You may only have one spring or you could have two. Garage door springs are very dangerous for the inexperienced to work with. You could be injured or even killed if you attempt adjustment or replacement on your own.

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