Fault description Cause Remedy Personnel
Serious crystalline deposits
on the ball seat due to the
valves drying out.
Dismantle the valves and clean them - refer
to the "Overhaul" chapter.
Technical
personnel
Fluid is escaping from the
backplate.
The screws in the dosing
head are too loose.
Tighten the screws in the dosing head in a
diagonal pattern - refer to the "Repairs"
chapter for tightening torque.
The diaphragm is not leak-
tight.
Replace the diaphragm - refer to the "Over‐
haul" chapter.
If a diaphragm rupture has been indicated,
clean the diaphragm rupture reporter, refer to
the "Overhaul" chapter.
Technical
personnel
The CAN LED flickers after
connection of the HMI to
the pump.
The software versions of
the pump and HMI are dif‐
ferent.
Wait. In the log term, arrange for service to
update the pump software.
Green LED display (oper‐
ating indicator) does not
light up.
The wrong mains voltage or
no mains voltage is con‐
nected.
Connect the pump correctly to the specified
mains voltage - according to the specification
on the nameplate.
Electrician
13.2 Fault messages
Red LED "Fault indicator" lights up.
Fault description Cause Remedy Personnel
The "Level" symbol appears flashing on
the LCD screen, plus the error message
„Level error“
E-33-3 and the pump stops.
The fluid level in the
storage tank has reached
"Liquid level low 2nd
stage".
Top up the storage tank. Technical
personnel
The symbol "External"
MEMappears
flashing on the LCD screen plus the error
message
„Memory overflow“
E-34-3 and
the pump stops.
The stroke tank has over‐
flowed.
Rectify the cause, then
press the
[P/OK]
key (think
through the consequences
for the process!).
Technical
personnel
The symbol i < 4mAappears flashing on the
LCD screen plus the error message
„Under
4mA“
E-35-3 and the pump stops.
The pump is in
„Analog“
„operating
mode“
, a fault behaviour
has been programmed in
the
„ANALOG“
menu and
the control current has
fallen below 4 mA.
Eliminate the cause of the
low control current or
Technical
personnel
The symbol i > 20mAappears flashing on
the LCD screen plus the error message
„Under 20 mA“
E-36-3 and the pump stops.
The pump is in
„Analog“
„operating
mode“
, a fault behaviour
has been programmed in
the
„ANALOG“
menu and
the control current has
risen above 23 mA.
Eliminate the cause of the
high control current or
Technical
personnel
The symbol "Flow"
FLOWappears
flashing on the LCD screen plus the error
message
„Defective stroke dosing“
E-37-3
and the pump stops.
The dosing monitor is not
correctly connected.
Connect the dosing monitor
correctly and
Press the
[P/OK]
key.
Electrician
The dosing monitor
reported too few strokes,
more than set in the
„FLOW“
menu.
Press the
[P/OK]
key.
Investigate and clear the
cause
Technical
personnel
The symbol "Membrane"
DIAappears
flashing on the LCD screen and the error
message
„Diaphragm break“
E-38-3 and
the pump stops.
The diaphragm is broken. Replace the diaphragm and
clean the diaphragm rupture
sensor, refer to the "Repair"
chapter.
Technical
personnel
Troubleshooting
80