Xylem Flygt 3201, Installation Operation & Maintenance, Page: 43 / 48

The pump does not stop when a level sensor is used
WARNING:
Always disconnect and lock out power before servicing to prevent unexpected startup.
Failure to do so could result in death or serious injury.
Cause Remedy
The pump is unable to empty the
sump to the stop level.
Check that:
• There are no leaks from the piping and/or discharge connection.
• The impeller is not clogged.
• The non-return valve(s) are functioning properly.
• The pump has adequate capacity. For information:
Contact the local Xylem service shop.
There is a malfunction in the level-
sensing equipment.
• Clean the level regulators.
• Check the functioning of the level sensors.
• Check the contactor and the control circuit.
• Replace all defective items.
The stop level is set too low. Raise the stop level.
If the problem persists, refer to the Flygt Service Guide on the web or contact the local
Xylem service shop. Always state the serial number of your pump when you contact Xylem,
see
Product Description (page 11).
The pump starts-stops-starts in rapid sequence
Cause Remedy
The pump starts due to back-flow
which fills the sump to the start
level again.
Check that:
• The distance between the start and stop levels is not too small.
• The non-return valve(s) work(s) properly.
• The rinser is not too long without a non-return valve.
The self-holding function of the
contactor malfunctions.
Check:
• The contactor connections.
• The voltage in the control circuit in relation to the rated voltages on the
coil.
• The functioning of the stop-level regulator.
• Whether the voltage drop in the line at the starting surge causes the
contactor's self-holding malfunction.
If the problem persists, refer to the Flygt Service Guide on the web or contact the local
Xylem service shop. Always state the serial number of your pump when you contact Xylem,
see
Product Description (page 11).
Troubleshooting
Flygt 3201 Installation, Operation, and Maintenance Manual 41