Pump Disconnected

Spray tank is plugged into the drone but gives “pump disconnected” error.

Cause:

1. Poor connection at a plug.
   1. This can come from plugs not being fully seated or damage to the plug receptacle.
2. Damage a wire or connection.
   1. The wires that run to the tank board, or from the tank board to the pumps can get damaged physically and cause the pumps to be disconnected.
3. The pump motor is damaged.
   1. The pump motors can go bad or be damaged over time or from mishandling.
4. One of the centrifugal spinner motors is bad or has a cracked plug.
   1. The spraying system electronically is all interconnected so the centrifugal motors can affect the pumps.

Diagnosing:

1. Check all connection points to make sure plugs are fully seated into the receptacle.
   1. Due to the water proofing seals the plugs can sometimes be difficult to fully seat into the plugs.
2. Check all plugs related to the spraying system, including the centrifugal motors, for cracks, bent pins, or any other damage.
   1. If there is a crack in any plugs, water can get in or it can cause poor contact with the pins of the plugs.
3. Switch the plugs on the pumps to see if the problem follows the plug or stays with the pump motor.
   1. This will allow you to see if the pump itself is the problem or if it is elsewhere in the drone.

Solutions:

1. Replace any wires, or motors that have been determined to have damage including centrifugal motors.
2. The spray tank board is the next part to replace if no other damage can be found.
3. If no damage was found, wires have been replaced, and the pump motor has been determined to not be the cause, replace the spray module on the aircraft.
4. If the spray module does not fix the issue, replace the cable distribution board.