An industrial truck including: - a chassis, - a mast pivotally mounted on the chassis, - a lifting element for lifting a load, the lifting element being mounted on the mast in a slidable manner along the mast, - a plurality of actuating units including: - a lifting actuator configured to move the lifting element along the mast, - a tilting actuator configured to tilt the mast with respect to the chassis, - a wheel drive system for driving wheels of the industrial truck, - a plurality of sensors including: - a load sensor for detecting the load on the lifting element, - a tilt angle sensor for detecting the tilt angle of the mast with respect to the chassis, and - a height sensor for detecting the height of the lifting element with respect to the mast, - a control unit configured to control the plurality of actuating units based on information detected by the plurality of sensors for achieving stability of the industrial truck during operation, wherein the control unit is configured to generate one or more control values by using a mathematical model of the industrial truck to which information detected by the plurality of sensors are inputted, the control unit being configured to control the plurality of actuating units based on the one or more control values, the industrial truck further comprising a rear axle load sensor configured to detect the load on a rear axle of the industrial truck, wherein the control unit is configured to control the operation of the industrial truck also based on a rear axle load value detected by the rear axle load sensor characterized in that the control unit is configured to perform a control function check procedure, the control function check procedure comprising: - calculating an estimated value of the load on the rear axle by using the mathematical model, - comparing the estimated value with the rear axle load value detected by the rear axle load sensor, and - generating an alarm signal when the difference between the estimated value and the detected rear axle load value exceeds a predetermined threshold. - a chassis, - a mast pivotally mounted on the chassis, - a lifting element for lifting a load, the lifting element being mounted on the mast in a slidable manner along the mast, - a plurality of actuating units including: - a lifting actuator configured to move the lifting element along the mast, - a tilting actuator configured to tilt the mast with respect to the chassis, - a wheel drive system for driving wheels of the industrial truck, - a lifting actuator configured to move the lifting element along the mast, - a tilting actuator configured to tilt the mast with respect to the chassis, - a wheel drive system for driving wheels of the industrial truck, - a plurality of sensors including: - a load sensor for detecting the load on the lifting element, - a tilt angle sensor for detecting the tilt angle of the mast with respect to the chassis, and - a height sensor for detecting the height of the lifting element with respect to the mast, - a load sensor for detecting the load on the lifting element, - a tilt angle sensor for detecting the tilt angle of the mast with respect to the chassis, and - a height sensor for detecting the height of the lifting element with respect to the mast, - a control unit configured to control the plurality of actuating units based on information detected by the plurality of sensors for achieving stability of the industrial truck during operation, wherein the control unit is configured to generate one or more control values by using a mathematical model of the industrial truck to which information detected by the plurality of sensors are inputted, the control unit being configured to control the plurality of actuating units based on the one or more control values, the industrial truck further comprising a rear axle load sensor configured to detect the load on a rear axle of the industrial truck, wherein the control unit is configured to control the operation of the industrial truck also based on a rear axle load value detected by the rear axle load sensor characterized in that the control unit is configured to perform a control function check procedure, the control function check procedure comprising: - calculating an estimated value of the load on the rear axle by using the mathematical model, - comparing the estimated value with the rear axle load value detected by the rear axle load sensor, and - generating an alarm signal when the difference between the estimated value and the detected rear axle load value exceeds a predetermined threshold.