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