Troubleshooting the Syringe Pump

The syringe pump will not power on

When the power switch is flipped on, the blue power LED on the top left of the front panel should turn on and the pump should emit a single beep sound. If this does not happen and your syringe pump does not turn on, try a few of these steps to troubleshoot the device.

  1. Ensure that your outlets and power sources are actually supplying power. Lab equipment can often trip power breakers thus creating dead outlets.
  2. Make sure the power cords are securely plugged into the syringe pump.
  3. Check that the voltage selector is set to the same as your input voltage.
  4. If using a Nexus or OEM system, ensure that the AC/DC power adapter is rated for at least 65W.
  5. For Fusion systems, ensure that the voltage selector on the back of the pump matches the voltage of your power supply.
    • If using a 220V power source and the voltage selector is set to 110V, the fuse may have burned out and may need to be replaced. See our Replacing the Fuse article.
    • If using a 110V power source and the voltage selector is set to 220V, the pump screen may light up but will not operate or move.

If the following does not work, please contact Chemyx Technical Support and someone on our team will provide further assistance.

The syringe pump stalls during a run

Frequent stalls typically the result of one of four possible issues: incorrect setting, excessive back pressure, inefficient power, or a malfunctioning pump.

  • For Fusion series pumps, there is a motor power setting under Power in the initial Mode Selection screen. If the motor power is set to less than 100%, the pump is more likely to stall under normal application. Please change the motor power back to 100%, and run your application again. Nexus series pumps run at full motor power at all times and do not have this setting.
  • Several factors are involved in creating back pressure during your application. Higher viscosity fluids, higher flow rates, long tubing, and small diameter tubing will all contribute to increasing back pressure. If the back pressure of your application exceeds the maximum pressure for your syringe pump/syringe combination, the pump will likely stall. Please read our article, Calculating and Minimizing Back Pressure, for more information.
  • The linear force exerted by Chemyx syringe pumps can be significantly diminished if there is not sufficient power to the pump. This can cause the pump to stall during a run even though the application’s back pressure should not exceed the maximum allowed by the pump. For example, a 90V power supply is insufficient for running the pump at full capacity, and the pump will likely stall more frequently during a routine application. Additionally, for the Nexus series pump, please be sure to use a 65W AC/DC power adapter, as any lower rated adapter will likely cause more frequent stalls. Chemyx offers replacement 65W power adapters if needed.
  • If the above three issues do not address the stalling problem, there may be an issue with the pump itself. Please contact Chemyx Technical Support for more help.

The LCD screen will not turn on

In order to prolong the life of the LCD screen, Chemyx syringe pumps will automatically turn off the LCD display after a certain amount of time of non-use even though the pump remains powered on. The amount of time can be specified in the pump’s settings. The screen should awake immediately upon any button being pressed or, in the case of Fusion series pumps, when the LCD screen is touched.

  • If the pump is powered on but the LCD screen never turns on, please contact Chemyx Technical Support for service.
  • For Fusion systems, if the LCD screen turns on but is completely white or dark without any displaying any graphical information, please check to make sure the voltage switch on the back of the pump is set to the voltage matching your power supply. If this switch is correctly set or the system is not a Fusion series pump, the LCD screen will most likely need to be replaced. Please contact Chemyx Technical Support for service.

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