11. TROUBLESHOOTING CHART
a. Inner pump parts are
worn.
b. Density or viscosity of
pumped fluid is not same
as designed.
c. The motor voltage is
incorrect.
d. Motor runs only in two
phase mode.
e. Pump not primed.
f. Speed too low.
g. Feed pipe or impeller
plugged.
h. Clogged suction.
i. Damaged impeller.
j. Wrong rotation.
k. Pump or piping are not
properly vented.
l. Formation of air
pockets in the piping.
m. The counter pressure
of the system is greater
than the design point of
the pump.
n. NPSHa too low.
a. Change worn parts.
b. Consult a Ruhrpumpen dealer.
c. Apply correct voltage to the motor.
d. Check the cables, connections and fuses.
e. Prime pump.
f. Check driver input.
g. Clean pipe and impeller.
h. Clean out suction line.
i. Replace impeller.
j. Check driver rotation.
k. Vent or top up.
l. Install vent valve or lay piping elsewhere.
m. Open discharge valve as wide as necessary to reach
the operating point.
n. Check the fluid level in the feed container.
Open suction valve completely.
Lay suction pipe elsewhere if friction losses are too
big.
Check for a possible filter in the feed pipe.
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