Troubleshooting

Pump priming problems can be caused by clogged or blocked suction and discharge lines. Priming can be difficult or impossible when suction lines are not airtight. Check suction strainer an injection valve for clogs. Check suction tubing or piping connection at the pump. Redo connections as needed. Also check to make sure tubes and rollers are compatible and installed correctly.

There are a few reasons why the pump can lose prime. Typically, there is a poor seal or leak in the suction line somewhere above the solution level, or the level of the solution has dropped below the end of the suction tubing causing the solution to fall out of the suction tube. Check the tubing connection at the pump and ensure it is tight and leak free. Check all other connections, fittings, valves, and unions in the suction line to ensure there proper seals which will prevent the pump from drawing air into the suction. A faulty or worn pump roller, incorrect pump roller, or damaged pump head or pump shaft can also contribute to losing prime by not allowing the pump to properly pinch/squeeze the tube.

Some pump models have limitations when it comes to operating below the 10% mark on the dial knob. This restriction is primarily because of the minimum current needed to overcome the locked rotor current condition and the load applied from the tube. The specific percentage speeds for each RPM and tube combination can be found in the attached chart.

check for liquid in the pump head area Make sure the TFD sensor pins are clean and remove any residual build up.