Door opens by itself without any user command

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

Step-by-step:

• Check wall controls: Inspect Hormann push buttons or key switches. Disconnect the wall control wiring at the operator and monitor if the problem stops.
• Clear receiver memory: Erase all learned remotes from the receiver, then re‑learn only your own transmitters.
• Change remote code (if applicable): For older fixed‑code remotes, change the DIP switch pattern on all remotes and receiver to a unique combination.
• Test receiver: If the door still opens randomly with wall control disconnected and remotes cleared, replace the radio receiver module.