Process control systems may encounter a variety of issues, such as sensor failure, actuator failure, controller failure, and feedback failure. Sensor failure, for example, may result in incorrect or inconsistent readings, false alarms, or loss of control. To troubleshoot this problem, you can use the diagram to check the sensor status, signal quality, wiring, and calibration. Additionally, you can compare the sensor reading with another sensor or a manual measurement. To solve this problem, you can replace, repair, clean, adjust, or recalibrate the sensor. Similarly, actuator failure may cause overshoot, undershoot, oscillation, instability, or loss of control. To troubleshoot this problem, you can use the diagram to check the actuator status, signal quality, wiring and tuning. Additionally, you can compare the actuator output with the controller output or a manual command. To solve this problem you can replace, repair clean adjust or retune the actuator. Controller failure may lead to offset errors deviation instability or loss of control. To troubleshoot this problem you can use the diagram to check the controller status signal quality wiring and tuning. You can also compare the controller output with the desired output or a manual command and then replace repair reset or retune the controller if necessary. Lastly feedback failure may cause error deviation instability or loss of control. To troubleshoot this problem you can use the diagram to check the feedback loop status signal quality wiring and loop interaction. You can also compare the feedback signal with the output signal or a manual measurement and then replace repair filter isolate or modify the feedback loop if necessary.