Abstract: A coupler control system (10) for coupler on an excavator arm (14) of an excavator (12), the coupler comprising a hydraulic actuator (60), the excavator comprising a solenoid valve (20) for controlling operation of the coupler's hydraulic actuator (60), the excavator arm (14) comprising a boom arm (36) and a stick (40), both operated by separate hydraulic actuators, and a bucket actuator (44) for rotating an accessory relative to the stick (40), the coupler control system (10) comprising a controller linked to the solenoid valve (20) for controlling operation of the coupler's hydraulic actuator (60), a status indicator (22), a coupler control switch (24) for locating in the cab of the excavator and a pressure sensor (28) for connecting to the hydraulic system for at least one of the hydraulic actuators for the boom arm, the stick or the bucket actuator, wherein the coupler control switch and the status indicator are connected to the controller, the pressure sensor is arranged to sense when the hydraulic fluid