Safety first: Disconnect mains power before removing covers. Keep clear of moving parts.

Step-by-step:

Check mechanical drive: Inspect the Hormann operator rail, chain or belt for slack or damage. Tighten the chain/belt tension according to the manual.
Verify door balance: Release the operator and move the door manually. If the door is unbalanced, have the springs adjusted by a professional before resetting limits.
Reset travel limits: Restore power. Follow the Hormann programming procedure to set open and close positions (usually via the “PRG” button and up/down commands). Allow the operator to run a full open/close cycle to learn limits.
Check limit sensor: If the operator uses a magnetic or electronic encoder on the rail, inspect the sensor and magnet strip for damage or misalignment. Ensure the sensor plug is firmly seated on the control board.
Retest: Run several full cycles. If the error returns, the limit sensor/encoder or control board may require replacement.

Operator display shows “5” and door does not respond to commands

Possible Causes