Troubleshooting
18
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
After diaphragm and valve
plates/sealings (valve plates) have
been replaced
Î
Check that the spacers have been replaced onto the
diaphragm screw thread.
Î
Check head connection and hose connections for leaks.
Î
Possibly carefully tighten the outer screws of the top plate
crosswise.
Tab. 8
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause
Fault remedy
Pump is not connected with the
power source.
Î
Connect pump to mains power.
No voltage in the power source
Î
Check room fuse and switch on if necessary.
Fuse in the pump is defective.
Î
Remove pump’s mains plug from the socket.
Î
Loosen marked lid on underside of the pump.
Î
Select and replace suitable fuse (see chapter 4).
Tab. 9
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause
Fault remedy
The thermal switch has opened
due to overheating
Î
Remove pump´s mains plug from the socket.
Î
Allow pump to cool.
Î
Trace cause of over-heating and eliminate it.
Tab. 10
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see first page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases (see chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump to KNF with a filled out decontamination decla-
ration (see chapter 11) and specification of the medium trans-
ferred.
Summary of Contents for Laboport PM26285-811.18
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