TOP 25 ERROR CODES

Stryker Neptune 2 Error Codes


Click on Known Use Error Messages below.

It is important to acknowledge and be aware of potential hazards associated with the Neptune 2 Waste Management System prior to use. This information highlights known use errors that constitute improper and unsafe use of the Neptune 2 system. 

Top 25 Error Codes

Description: “Small Potentiometer Out of Range”


Error Type: Level Scan


Logged: Yes


Prevent Rover Use: Yes


Stop Current Dock Cycle Result: No


Display to User: Yes


Possible Causes: Voltage reading from small potentiometer out of expected range


Troubleshooting: Readjust Potentiometer

Description: “Large Potentiometer Out of Range”

Error Type: System

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: Voltage reading from large potentiometer out of expected range

Troubleshooting: Readjust Potentiometer

Description: “Small Tank Float Calibration Error”

Error Type: EEPROM

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Canister was replaced and float was not calibrated. Main controller PCBA was replaced. EEPROM was reset in technician mode

Troubleshooting: Recalibrate Small Canister. Calibrate float.


Description: “Large Tank Float Calibration Error”

Error Type: EEPROM

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Canister was replaced and float was not calibrated. Main controller PCBA was replaced. EEPROM was reset in technician mode

Troubleshooting: Recalibrate Large Canister. Calibrate float.


Description: “UART Checksum Error”

Error Type: COMM

Logged: No

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: No

Possible Causes: N/A

Troubleshooting: Recalibrate Small Canister. Calibrate float.


Description: “Docker Communication Error”

Error Type: Docking

Logged: Yes

Prevent Rover Use: N/A

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Rover main control board bad. Rover IR board bad. Docker IR board bad. Wiring harness bad.

Troubleshooting: Problem is most likely due to IR communication failure. Check IR to make sure it is connected properly and is not obstructed. If a component has failed you will most likely receive a "Docker not Ready" fault as well.


Description: “Offload Error - Small Tank”

Error Type: Docking

Logged: Yes

Prevent Rover Use: N/A

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Fluid is not offloading due to clog. Something preventing float from reaching the bottom of tank. Small Canister calibration board damaged. Level transducer damaged. Calibration is incorrect.

Troubleshooting: Verify that something is not blocking the drain valve from emptying.

- Verify nothing is underneath the float.

- Recalibrate the canister.

- Replace small tank float sensor

- Replace Small Canister

- Replace Fluid Leve Transducer


Description: “Offload Error – Large Tank”

Error Type: Docking

Logged: Yes

Prevent Rover Use:

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Calibration is incorrect. Clog or obstruction in the Large Tank/Canister. Offload pump not running.

Troubleshooting: Recalibrate Large Canister. Check for and remove clog or obstruction. Check for proper voltage at offload pump.


Description: “Prefill Error - Small Tank”

Error Type: Docking

Logged: Yes

Prevent Rover Use: N/A

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Calibration is incorrect. Water has been shut off Troubleshooting: Recalibrate. Turn water on.


Description: “Prefill Error - Large Tank”

Error Type: Docking

Logged: Yes

Prevent Rover Use: N/A

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Calibration is incorrect. Water has been shut off Troubleshooting: Recalibrate. Turn water on.


Description: “Docking Cycle Not Completed”

Error Type: Docking

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: This fault will be present at power up if the Rover had any error while docking.

Troubleshooting: Redock the Rover


Description: “High Volume Error”

Error Type: Empty Tank

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: N/A

Display to User: Yes

Possible Causes: N/A

Troubleshooting: Dock the Rover


Description: “Prefill Timeout”

Error Type: Empty Tank

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: N/A

Display to User: Yes

Possible Causes: Prefill pump is not running. Fluid Level Transducer not functioning. Faulty power distribution board. Prefill tank is empty

Troubleshooting: Verify proper operating voltage for prefill pump. Replace Rover power distribution board. Dock the Rover


Description: “Drain Valve Timeout”

Error Type: VALVE

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Something stuck in drain valve. Drain valve bad. Power distribution board bad. Bad wiring harness to drain valve motor

Troubleshooting: Try to manually turn valve with a wrench to verify that it turns.

Replace drain valve. Replace power distribution board. Check for proper voltage at wire harness.


Description: “Gradient Fetch Error”

Error Type: LEVEL

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Possibly the Fluid Level Transducer

Troubleshooting: Hook up a different transducer outside the Rover to verify error goes away. If it doesn't it could be the wire harness or the boards.


Description: “Missing All Magnets 100%”

Error Type: Level Scan

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: The magnet errors are designed to indicate what percentage of time the software reads the magnets. There are three states of magnet reporting that are listed in three, varying percentages of time. The three states are ALL, EXTRA, and no modifier (for only one). These three conditions can exist in varying degrees ranging from 1-5 at the lowest, to 5-128, to 100% of the time.

Missing:                  Indicates only one magnet missing.

Extra:                       Indicates only one extra magnet.

Missing All:           Indicates all magnets


Description: “IV Pole Comm Error”

Error Type: POLE

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: Wiring harness from the main control board to power distribution board bad. Main control board bad. Power Distribution board bad

Troubleshooting: Ohm check interface wiring harness


Description: “Smoke Evacuator Comm Error”

Error Type: SMOKE

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: Wiring harness bad between power distribution board and main control board. Power distribution board bad

Main control board failed

Troubleshooting: Ohm check wiring harness. Replace power distribution board. Replace main control board


Description: “Volume Display Comm Error”

Error Type: Vol DISPLAY

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: Wiring harness bad between volume display and main control board. Power distribution board bad. Main control board failed

Troubleshooting: Ohm check wiring harness. Replace volume display. Replace main control board.


Description: “Canister Reader Comm Error”

Error Type: Canister

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Wiring harness bad between power distribution board and main control board. Power distribution board bad.

Main control board failed

Troubleshooting: Ohm check wiring harness. Replace power distribution board. Replace main control board.


Description: “UART Error”

Error Type: VACUUM - LARGE - VAC

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Wiring harness bad between power distribution board and main control board. Power distribution board bad. Main control board failed

Troubleshooting: Ohm check wiring harness. Replace power distribution board. Replace main control board


Description: “Regulator Init Span High”

Error Type: VACUUM - LARGE - MOT

Logged: Y

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Most vacuum errors can be narrowed to either the regulator or the power distribution board and associated wiring harness. To determine which has failed, swap the connectors for the

Troubleshooting: Replace Vacuum Manifold Assembly


Description: “UART Error”

Error Type: VACUUM - SMALL - VAC

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Wiring harness bad between power distribution board and main control board. Power distribution board bad. Main control board failed

Troubleshooting: Ohm check wiring harness. Replace power distribution board. Replace main control board


Description: “Regulator Init Span High”

Error Type: VACUUM - SMALL - MOT

Logged: Yes

Prevent Rover Use: Yes

Stop Current Dock Cycle Result: Yes

Display to User: Yes

Possible Causes: Most vacuum errors can be narrowed to either the regulator or the power distribution board and associated wiring harness. To determine which has failed, swap the connectors for the large and small tank regulators. If the problem occurs in the other canister after the switch, then the regulator is bad. (part of the Vacuum Manifold Assembly P/N 0702-001-110Q) If not, then proceed to check the wiring harness and power distribution board.

Troubleshooting: Replace Vacuum Manifold Assembly


Description: “Power Coupler Communication Timeout”

Error Type: POWER COUPLER

Logged: Yes

Prevent Rover Use: No

Stop Current Dock Cycle Result: No

Display to User: Yes

Possible Causes: N/A

Troubleshooting: Replace power distribution board


Share by: