Door opens by itself or closes unexpectedly without any command from the user.

Safety first: Until resolved, disconnect power when the door is not supervised to prevent accidental movement.

• Isolate wall circuit: Disconnect the START input wires at the Nice board. If the problem stops, inspect the wall button, key switch, and wiring for shorts or moisture.
• Clear and reprogram remotes: Erase all remotes from the Nice receiver memory and reprogram only your own remotes to rule out interference from unknown transmitters.
• Check external devices: Open key switches and keypads to look for water or corrosion that could bridge contacts. Seal or replace as needed.
• Board evaluation: If the door still moves with all external inputs disconnected, the control board's input circuitry or relay may be failing and should be replaced.