Possible Causes:
The pump might be clogged and is not able to spin
Bad pump motor
Wire Harness to the pump went bad or corroded
Spray Board that is located on the back of the spray tank is bad
Main wire from the drone to spray board went bad or corroded
Troubleshooting Steps:
Make sure the pump(s) are not clogged, this can be done by disassembling the pump and inspecting the impeller
Check wiring for corrosion and make sure all wiring are fully plugged in
If you have multiple drones, try swapping the full tank assembly with another drone to determine if the issue is with the tank or the drone. If the problem persists after swapping the tank, proceed to step 5C. If the issue is resolved, continue to step 3 to troubleshoot the tank
If only ONE pump is having this issue:
Swap the wiring from the other pump to faulty pump to see if its the pump motor
If the pump doesn't work, replace Impeller Pump Motor
If faulty pump does work, then the pump is not the issue. Next try to replace Impeller Pump Signal Cable.
If replacing the Impeller Pump Signal Cable does not fix issue, next would be to replace Spraying Adapter Module, this is located on the back side of the spray tank.
If replacing Spraying Adapter Module does not fix issue, next replace Spraying Signal Cable
If BOTH pumps are having this same issue:
You can start by replacing the Impeller Pump Signal Cable.
If impeller pump signal cable doesn't fix issue, next replace Spraying Adapter Module
If Spraying Adapter Module doesnt fix issue replace Spraying Signal Cable.
If Spraying Signal Cable does not fix issue, then problem is with the drone and not spray tank
Will need to replace the Spraying Module and/or Cable Distribution Board Module