Why does my garage door bounce back up when it hits the floor?

The Opener Thinks the Floor Is an Intruder

Modern openers have two protective senses at the bottom of travel. The close-limit tells the motor where the floor should be; the force sensor watches for unexpected resistance before that point. The safety logic is deliberate: resistance before the expected floor means something is under the door, so reverse immediately. Bounce-back happens when those two senses disagree with reality. If the limit says the floor is half an inch lower than it actually is, the door reaches concrete early, the force sensor reads it as an obstruction, and up it goes. Same symptom if the limit is right but the force setting is so sensitive that normal seal compression reads as a collision.

Rule out the honest triggers first: a stone in the threshold, ice, a garden hose, a buildup of leaves against the seal, or photo eyes that are misaligned just enough to trip as the door reaches the floor (most openers blink the overhead light when the eyes caused the reversal, which is a useful tell).

Adjusting Limits and Force Without Guesswork

• Older units (roughly pre-2011): plastic screw dials on the motor head labeled Down/Close Limit and Down Force. Turn the limit screw in small increments, a quarter turn at a time, cycling the door between adjustments. Chasing it with big turns overshoots in both directions.
• Newer LiftMaster, Chamberlain, and Genie units: limits are programmed with buttons and arrows, and force is self-calibrating on many models; the fix is often re-running the travel-learning sequence so the opener re-measures the floor.
• The right end state: door seals firmly with the bottom rubber slightly compressed, no daylight at the corners, and it reverses promptly when you place a 2x4 flat under it. That last test is the safety check, and it is non-negotiable; a door adjusted so hard it crushes the board is set dangerously.

A bottom seal that has gone rigid in the sun deserves mention: hardened rubber does not compress, so the opener feels a wall instead of a cushion. Seal replacement is one of the least expensive garage door fixes there is and often ends the bouncing outright.

The Slab Moved, Not the Door

Central Oklahoma's expanding clay soil lifts and drops garage slabs through the wet-dry cycle, and half an inch of heave at the threshold is enough to turn a perfectly adjusted opener into a serial bouncer every spring. If your bounce is seasonal, or the floor visibly slopes at one corner of the opening, the opener needs re-teaching rather than repairing, sometimes yearly, and a taller bulb seal can bridge unevenness. A closely related symptom, the door that stops short instead of reversing, is covered in our answer on doors stopping inches from the floor. If adjustments do not hold, or the door also drags or scrapes, have a tech look for track shift; that is standard opener service territory, wrapped up in one visit with a free estimate anywhere in the metro. A door that will not stay closed is a security and critter problem, so do not let it linger; call (405) 247-0336 and we will get it seating properly.