Door closes, hits the floor, then immediately reverses and opens fully.

Safety first: Keep clear of the door while adjusting limits.

Adjust down limit:

• Locate the DOWN limit adjustment screw on the Decko opener.
• Turn the screw in the direction that reduces travel (usually counterclockwise) by 1/4 turn.
• Test closing. Repeat until the door stops just at the floor without significant bounce.

Inspect floor and seal:

• Check for high spots in the concrete or objects under the door.
• If the bottom seal is excessively stiff or deformed, replace it with a compatible seal.