ACU 524222.02 – Resume Switch Circuit Conflict

ACU 524222.02 (ACU )

Code: 524222.02



The error code ACU 524222.02 is triggered when the resume switch circuit in the control system fails to differentiate between the ON and OFF positions, showing the same value for both states. This issue indicates a malfunction within the switch circuit that prevents accurate reading of the switch status.


Due to the inability to ascertain the correct position of the resume switch, the control unit has not taken any action, leaving the status unchanged to avoid incorrect operation based on faulty input.


  • Inspect the resume switch for any physical damage or signs of wear that might affect its function. Ensure that the switch mechanism is not stuck or obstructed.
  • Test the electrical continuity of the resume switch in both the ON and OFF positions to verify if the circuit correctly changes states. Use a multimeter or a circuit tester for this purpose.
  • Check the wiring and connectors linked to the resume switch for loose connections, corrosion, or damage that could impair signal transmission and lead to incorrect readings.
  • Recalibrate or replace the resume switch if tests show that it cannot reliably differentiate between ON and OFF positions.
  • After any necessary repairs or replacements, retest the switch to ensure it now correctly reflects its various states and communicates accurately with the control unit.


Reliable operation of control switches is crucial for the proper functioning of machine systems. Regular maintenance and timely repairs are essential to ensure all components operate as intended and to prevent issues from affecting machine performance.