Fault description Cause Remedy
No metering - dosing
pump rattles.
Counter-pressure too high. Reduce pressure at pressure retention
valve.
Discharge line and/or valve
blocked.
Disassemble and clean valve(s) and
lines on the pressure side, and clear
blockage.
Actual counter-pressure in
equipment (= total of all
pressure losses) is too
high.
Determine and calculate pressure loss of
entire system, and compare/check pump
system layout
Dosage is too small. Dosage setting incorrect.
increase output (
Ä
Chapter
6.1.1 ‘Setting the flow rate’ on page 33).
Suction line leaking. Check/service connections and suction
line, and replace if necessary.
Dosage counter-pressure
too high.
Check actual counter-pressure (= total of
all pressure losses) and valves and lines
on pressure side - clear bottlenecks.
Viscosity setting incorrect.
Check jumper position and viscosity (
Ä
‘
Setting’ on page 33).
Wrong pump head. Install correct pump head.
Dosing pump does not
work.
Operating voltage too low /
not on.
Check operating voltage / control.
Power cord damaged. Replace power cord.
Motor / electronics faulty. Replace pump module (II).
Switched-mode power
supply (SMPS) faulty (in
230 V back cover
modules).
Check SMPS: OK = LED lights up,
replace SMPS if necessary.
Pump doesn't draw. Suction line leaking. Check and service suction line and
connections, and replace if necessary.
Storage container empty /
fill level too low.
Fill / replace storage container.
Air in pump head and
suction line.
Briefly reduce dosage counter-pressure
and bleed pump.
Sediment, valves sticking
or blocked.
Flush pump head via suction line;
remove and clean dispensing head, or
replace if needed.
Pump head leaking. Pump head mounting
screws loose.
Tighten pump head screws crosswise
(M = 3,75 Nm).
Medium leaks from
diaphragm failure drain.
Diaphragm is torn. Replace pump head and diaphragm.
Malfunctions / Repairs
43 Rev. 5-06.2018
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