Root cause: Power motor malfunction due to backlash or mechanical binding

Diagnostic procedure: Manually rotate the motor shaft. If resistance is detected or foreign objects are present, replace the motor immediately.

Main causes:

 Potential causes:

 ①Overweight flight

 ②High-temperature operation leading to current overload

Cause of occurrence:

Check if the motor is jammed, leading to excessive output current and the temperature reaching the motor's critical value.

Troubleshooting method:

Inspect the power motor for any foreign objects causing obstruction, allow it to cool down for a period, and then restart. If the fault persists, please replace the power motor.

Failure Cause:

• CAN bus communication disconnection between main controller and control module.

Troubleshooting Steps:

1. ​Inspect Wiring Connections:
   • Check all wiring connections related to the system.
2. ​Test Actuator Housing:
   • If wiring is normal, inspect the actuator housing for damage or loose components.
3. ​Replace Actuator Housing (if required):
   • Replace the actuator housing if faults persist.

Failure Cause:

• CAN bus communication disconnection between main controller and control module.

Troubleshooting Steps:

1. ​Inspect Wiring Connections:
   • Check all wiring connections related to the system.
2. ​Test Actuator Housing:
   • If wiring is normal, inspect the actuator housing for damage or loose components.
3. ​Replace Actuator Housing (if required):
   • Replace the actuator housing if faults persist.

Failure Cause:

• Significant discrepancy between servo motor expected values and actual readings detected.

Troubleshooting Steps:

1. ​Inspect Servo Motor and Rotor:
   • Check if the servo motor or rotor is physically jammed.
2. ​Check Wiring Connections:
   • If no mechanical blockage is found, verify the servo motor wiring for damage or loose connections.
3. ​Determine Servo Motor Condition:
   • If wiring is intact, test the servo motor functionality.
   • Replace the servo motor if confirmed to be faulty

Failure Cause:

• Short circuit of the flow meter may occur after the left spray nozzle actuator reports disconnection, as both share a common communication link with the flow meter/controller interface.

Troubleshooting Steps:

1. ​Test Left Nozzle Actuators:
   • Remove the left spray nozzles sequentially and restart the system.
   • Observe if the fault persists.
2. ​Determine Fault Source:
   • If the fault resolves after removing a nozzle → Replace the faulty spray nozzle actuator.
   • If the fault remains → Replace the flow meter.

Failure Cause:

• Short circuit of the water pump may occur after nozzle actuator disconnection, as both share a common communication link with the pump/controller interface.

Troubleshooting Steps:

1. Identify whether the left or right pump shows disconnection.
2. For the affected pump side:
   • Remove all nozzles sequentially and test system response.
3. If the fault persists:
   • Replace the water pump with a new unit

Failure Cause:

• Excessive current draw
• Overheating of the actuator

Troubleshooting Steps:

1. Power off the system and allow the disk/gear actuator to cool down.
2. Restart the system to check if normal operation is restored.
3. If unresolved:
   • Inspect the gear/disk actuator for physical damage.
   • Replace the spray nozzle actuator if necessary.