Troubleshooting

Common Issues 

Air is entering the pump.  Check suction lines to make sure all connections are tight. Check the level of the chemical tank.  Remove obstructions and clean strainers. 

Pump is not accurate.  Check the suction line and clean the strainer. Check for obstructions in suction lines, discharge lines, and injectors.  Check the discharge pressure and ensure consistent back-pressure on the pump.  

The pump is not running.  Check if the pump is waiting for a remote start/stop signal. Or make sure the Start arrow is pressed and the pump is Ready. If the pump is in 4-20ma mode or Frequency input mode, check the incoming signals at the pump to make sure the pump is receiving the proper signal, and ensure the cables are connected to the correct inputs at the rear of the pump. 

Electricals 

The MD3S will not power up. Check the power source or try a different power source.  Check to ensure the power cable is properly inserted in the power receptacle of the pump.  

The Remote Start/Stop is turning on/off or chattering.  Check the M12 cable’s integrity and proper connection to the pump. Check that all signal cables are shielded and properly grounded. Ensure signal wiring is not located or run next to high voltage power or equipment generating EMI.  Ensure power wiring to the pump is clean/conditioned.  

The 4-20mA signal is dropping or incorrect.  Check the M12 cable’s integrity and proper connection to the pump. Ensure the 4-20mA signal is powered via 15-24VDC. Check that all signal cables are shielded and properly grounded. Ensure signal wiring is not located or run next to high voltage power or equipment generating EMI.  Ensure power wiring to the pump is clean/conditioned.  

The Display reads an Error code.  Follow instructions on the pump and contact the factory for assistance.  Some error codes may be corrected with a current Firmware Update.  See System section for details on firmware updates.