Out of service (lift/elevator)

Out of service (some of the lifts labelled as not in use) is a special mode designed to remove a specified lift from service temporarily for maintenance, energy-saving, cleaning, or other reason.

Out of service mode is activated either by using a keyswitch or supervisory panel. When this mode is activated, the lift is withdrawn from service and floor indicators on both inside and outside will display "OUT OF SERVICE" (for most elevators) or "PARK" (for some Otis and older Sigma lifts) sign, often a symbol.
 * By a keyswitch, it is activated using a keyswitch on the call station or a separate keyswitch panel. It is usually labelled as STOP/RUN, OOS, 0-I, etc.
 * By a supervisory panel, it is activated using a keyswitch provided on the supervisory panel located on the lobby or security room.

Common

 * "對唔住，本升降機停用 (Cantonese), 對不起，本升降機停用 (Putunghua), Sorry! Lift not in use. (English)" - lifts installed in the Hong Kong Mass Transit Railways (MTR) stations.
 * "This lift is out of service." - lifts equipped with International Lift Equipment SerComms, SkyCom voice module, and Lester Controls Voice Synthesiser.
 * "​Elevator is out of service." ​- Australian Schindler 5500 voice.
 * "Lift out of service." ​- Stentorgate voice/Thames Valley Controls voice/Schindler EuroLift UK voice.

Custom

 * "Sorry! The lift you are taking is not in use for maintenance or cleaning reasons. If this is the lift bank you are taking, try another set of lifts to take you to that floor you are going to." - TransLink Building, Interchange City
 * "Attention! The lift or elevator you are taking is not in use for maintenance or cleaning reasons. Please take another set of lifts and choose your destination floor." - Plum Pudding Building, Interchange City (voiced by Plum Pudding)