25 Troubleshooting
If the pump display remains blank when the pump is on, make the following checks:
Check the position of the voltage selector switch. The voltage selector is mounted in the switchplate at the rear of the pump, protected from water by the 520N module. The module must be removed to allow access to the switch- plate. See 22.1 520N module removal and replacement.
Check the mains power switch at the rear of the pump.
Check that mains power is available to the pump.
Check the fuse in the fuseholder in the centre of the switchplate at the rear of the pump.
Check the fuse in the mains power plug if one is present.
If the pump runs but there is little or no flow, make the following checks:
Check that the tube and rotor are in the pumphead.
Check that fluid is supplied to the pump.
Check that the tube is not split or burst.
Check for any kinks or blockages in the lines.
Check that any valves in the lines are open.
Check that the correct
Check direction of rotation.
Check that the rotor is not slipping on the drive shaft.
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