If one or both of the pumps begin performing unusually, carefully observing the system in operation can help determine the appropriate diagnostic tests to perform. While observing, make a note of the following:

Whether the system initializes successfully when powered on.
Whether the pumps make any noise during initialization.
If excess pump noise occurs during pump drawing, pushing, or both drawing and pushing.
If excess pump noise only occurs during certain actions, such as "Add Sample," "Rinse," or pushing to SPE cartridge/disk.

Based on these factors, select the scenario below that matches the observations.

Type 1 - Initialization Error

"Pump Failed" Error During Initialization, No Grinding Noise
"Pump Failed" Error During Initialization, Audible Grinding Noise

Type 2 - Noise and/or Stalling during Operation

Excess Pump Noise During Drawing and/or Pushing for All Actions
Excess Pump Noise Only During Drawing, Only During "Add Sample" and the "Add Sample" Stage of "Rinse"
Excess Pump Noise Only During Pushing to Cartridge, or "Column Blockage Detected" Error
Excess Pump Noise Only During Pushing, Only During "Rinse" or "Clean"

Pump Troubleshooting