Watson-Marlow 120F/DV - Manual (Page 18)

Watson-Marlow 120F IP31 pumps: operating instructions 4
2.7 Troubleshooting
If the pump fails to operate, make the following
checks:
Check that the dedicated external DC power
supply unit is plugged into a working mains
power source which is switched on. Check that
the power supply unit’s LED is illuminated (if
fitted).
Check that the dedicated external DC power
supply unit’s output connector is plugged into
the pump.
If the pump runs but there is little or no flow, make
the following checks:
Check that tubing is installed in the pumphead;
check that it is Pumpsil—other tubing materials
are not suitable for use in a 120F pump; check
that the tubing is the correct wall thickness:
1.6mm.
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 rotor is in the pumphead, that
it rotates and that the rollers are in good
condition.
Check that fluid is supplied to the pump.