11
Fault Cause Remedy
1. Motor does not run when
started.
a) Electricity supply disconnected or loose
wires.
Connect the electricity supply. Check for loose
wires. DO NOT over tighten terminal screws.
b) Automatic circuit breakers cut out. Correct the fault and cut in the automatic
circuit breakers.
c) Motor protection activated. Correct the fault and reactivate the motor
protection.
d) Fuse in the PFU 2000 defective. Replace the fuse.
e) Motor defective. Repair/replace the motor.
2. Motor starts, but stops
immediately afterwards.
a) Fault in pressure transmitter. Check transmitter/wiring. If necessary replace
the pressure transmitter. Transmitters with
0-20 mA or 4-20 mA output signals are moni-
tored by the PFU 2000.
b) Dry running or no pre-pressure.
The operating pressure is not reached.
Check the supply of water to the pump. When
the pressure has been reestablished, the
pump will restart after 15 seconds and the
fault indication will remain.
3. Unstable water delivery
from BoosterpaQ MS
(applies only to very low
consumption)
a) Pre-pressure too low. Check the suction pipe and possible suction
strainer.
b) On/Off band set too low Increase On/Off band
c) Suction pipe/pumps partly blocked by
impurities.
Clean the suction pipe/pumps.
d) Pumps suck air. Check the suction pipe for leakages.
e) Pressure transmitter defective. Replace the transmitter.
f) Max. Limit set too low. Increase Max. limit.
4. Pumps are running, but
deliver no water or reduced
output
a) Suction pipe/pumps blocked by impurities. Clean the suction pipe/pumps.
b) Check valve blocked in closed position. Clean the check valve. The check valve must
move freely.
c) Suction pipe leaky. Check the suction pipe for leakages.
d) Air in suction pipe/pumps. Vent the pumps. Check the suction pipe for
leakages.
e) Motors running with the wrong direction
of rotation.
Change the direction of rotation.
5. Leakages from the shaft
seal
a) Shaft seal defective. Replace the shaft seal.
b) Height adjustment of pump shaft is
inaccurate.
Readjust the shaft height.
6. Noise a) The pumps are cavitating. Clean the suction pipe/pumps and possibly
the suction strainer.
b) The pumps do not rotate freely (frictional
resistance) due to inaccurate height adjust-
ment of the pump shaft.
Readjust the shaft height.
7. Very frequent starts and
stops
a) Wrong diaphragm tank precharge pressure. Check the diaphragm tank precharge pres-
sure.
b) Incorrect voltage. Check voltage during motor operation.
c) PMU settings other than factory. Review documentation and restore PMU to
original factory settings.
8. System only runs at max.
or “Off” (no regulation)
a) Fault in transmitter or signal. Check wire connections. Ensure bare wire,
NOT insulation, is compressed in termination
fitting. If connection is good replace pressure
transmitter.
Troubleshooting/Fault-finding chart
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