A safety system (105) for an elevator system (100). The safety system (105) includes a plurality of sensors (120) and a controller (110). Each of the plurality of sensors (120) is configured to produce an override signal when a landing door (112a) to which the sensor is connected is opened by manual override. The controller (110) is configured to instruct the elevator system (100) to automatically enter a special operating mode when the override signal is received from one of the plurality of sensors (120).

An elevator system (1) to be positioned in a hoistway (2). The elevator system includes an elevator car (3), at least one guide rail (4) for guiding the elevator car when moving up and down in the hoistway, and a security device (5) that is designed and arranged in such way that a safety volume (6) above or below the elevator car inside the hoistway can be set in at least one secured state for safe maintenance operation of a mechanic inside the safety volume. The security device comprises at least one first blocking device (7) attached to the at least one guide rail or configured for being mounted to a wall of the hoistway and at least one second blocking device (8) configured to be mounted on or in the elevator car to cooperate with the first blocking device.