KNF N85.3 - Troubleshooting

Troubleshooting Diaphragm pump N85, N86
36 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
10. Troubleshooting
DANGER
Extreme danger from electrical shock!

Disconnect the pump power supply before work-
ing on the pump.

Make sure the pump is de-energized and se-
cure.
 Check the pump (see Tab. 19 and Tab. 20).
Pump does not transfer
Cause
Fault remedy
Pump not connected to the
mains.

Connect pump to the mains.
No voltage in the mains.
 Check room fuse and switch on if necessary.
For pumps with brushless DC
motor:
Wrong polarity of the connection
wires
 Separate pump from the mains.
 Be aware of right polarity of the connection wires and con-
nect pump.
For pumps with AC motor:
The pump's thermal switch has
triggered.

Disconnect pump from the mains.
 Allow pump to cool.
 Identify and eliminate cause of overheating.
Connections or hoses are
blocked.

Check hoses and connections.
 Remove blockage.
External valve is closed or filter
is clogged.
 Check external valves and filters.
Condensate has collected in the
pump head.

Detach the condensate source from the pump.
 Flush the pump (see Chapter 9.2.1).
 Install the pump at the highest point in the system.
Diaphragm or valve plates are
worn.

Replace diaphragm and valve plates (see Chapter 9.3).
Tab. 19