ATC 000923.00 – Fan Motor Current Overload Protection. John Deere System Advisory.

ATC 000923.00 (ATC 923.00)

Code: 000923.00

Shortcode: 923.00


The error code, ATC 000923.00, indicates that the power module (HF) PC6 has measured a total amperage in excess of 40 amps at one or more of the fan motor outputs (B1 and/or C3). This high current level typically suggests a short to ground or a defective component within the monitored circuits of the fan motors (M07/M10), which can lead to overheating and potential damage to the fan motors and related circuitry.


To protect the system, current overload protection is activated, which may lead to the temporary deactivation of the fan motors. This response prevents further electrical damage and mitigates the risk of overheating other components.


  • Inspect Fan Motor and Circuitry: Check the fan motors and their associated circuitry for signs of damage, corrosion, or improper connections that might be causing a short to ground.
  • Measure Current and Voltage: Use a multimeter to measure current and voltage at the outputs B1 and C3. Verify if the measurements exceed normal operating ranges.
  • Identify and Replace Faulty Components: If specific components or wiring are found to be defective, replace them to ensure the integrity and functionality of the fan motor circuit.
  • Test Fan Motor Operation: After making repairs, test the fan motors to ensure they operate within the specified current limits without triggering the overload protection.
  • Review System Performance: Conduct a system review to ensure all parts are working correctly, and the issue of current overload does not reoccur.


Regular maintenance of the cooling system’s electrical components, such as fan motors, is essential for reliable operation and longevity of machinery. Ensuring that these components do not draw excessive current not only protects the hardware but also maintains system efficiency and performance. Addressing issues promptly helps minimize downtime and extend the operational life of the equipment.