KNF Laboport N86 KN.18 Mode D'emploi page 52

Troubleshooting
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
After diaphragm and valve
plates/sealings (valve plates) have
been replaced
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause
Pump is not connected with the
power source.
No voltage in the power source
Fuse in the pump is defective.
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause
The thermal switch has opened
due to overheating
24 Translation of original Operating Instructions, English, KNF 121435-121438 04/18
Fault remedy
 Check that the spacers have been replaced onto the
diaphragm screw thread.
 Check head connection and hose connections for leaks.
 Possibly carefully tighten the outer screws of the top plate
crosswise.
Tab. 13
Fault remedy
 Connect pump to mains power.
 Check room fuse and switch on if necessary.
 Remove pump's mains plug from the socket.
 Loosen marked lid on underside of the pump.
 Select and replace suitable fuse (see chapter 4).
Tab. 14
Fault remedy
 Remove pump´s mains plug from the socket.
 Allow pump to cool.
 Trace cause of over-heating and eliminate it.
Tab. 15
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last 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, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.
Mini Laboratory pumps N 86.18, N 811.18