Troubleshooting
Laboratory vacuum pumps N 8__.3 FT.40.18
30
Translation of original Operating Instructions, English, KNF 121350-121429 11/18
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
Replaced diaphragms and valve
plates/sealings
Check that the spacers have been replaced onto the dia-
phragm screw thread.
Check head connection and hose connections for leaks.
Possibly carefully tighten the outer screws (fig. 10/
4
or 11/
11
)
of the top plate crosswise.
Tab. 14
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.
Connect pump to mains power.
No voltage in the power source
Check room fuse and switch on if necessary.
Fuse in the pump is defective.
Remove pump’s mains plug from the socket.
All pumps except for N 860.3 FT.40.18:
Loosen marked lid on underside of the pump.
Pump N 860.3 FT.40.18:
Open connecting box of the pump (see fig. 3/
7
).
Select and replace suitable fuse (see chapter 4).
Tab. 15
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause
Cause
The thermal switch has opened
due to overheating
Remove pump´s mains plug from the socket.
Allow pump to cool.
Trace cause of over-heating and elimate it.
Tab. 16
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.
Summary of Contents for N 820.3 FT.40.18
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