Door closes then immediately reopens about 10–20 cm, without any error code on the Nice unit.

Safety first: Do not increase force beyond manufacturer recommendations; fix mechanical issues first.

• Check door movement by hand: Release the opener and move the door manually. It should move smoothly with moderate effort. Lubricate hinges and rollers and correct any binding.
• Inspect bottom seal: If a new, thicker seal was installed, the door may require a small limit adjustment so it does not compress excessively.
• Adjust force slightly: Increase the close force parameter or trimmer on the Nice board in small increments, testing after each change.
• Verify door type setting: Ensure the controller is programmed for the correct door type (sectional, up‑and‑over, etc.), as this affects force profiles.