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10.2
Causes and remedies
Error type:
1
2
3
4
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
91
5
6
7
8
Cause
Counter pressure too high
X
X
Pump and/or piping not completely
filled
X
X
Inlet pressure too low or suction head
too high
X
Sealing gap too large due to wear
Incorrect direction of rotation
Pump is suctioning air or the suction
line is leaky
Supply line or impeller clogged
Pump blocked by loose or jammed
parts
Air enclosures in the piping
Speed too low
• with frequency converter operation
• without frequency converter opera-
tion
Motor running on 2 phases
X
Counter pressure of the pump too low • Readjust the duty point or adjust
The viscosity or density of the fluid is
higher than the design value
X
X
X
Pump is stressed or the stuffing box
gland is inclined or tightened too
tightly
Speed too high
X
X
Pump unit poorly aligned
Thrust too high
Bearing lubrication not sufficient
Coupling distance not maintained
X
X
Flow rate too low
X
Housing screws not correctly tight-
ened or seal defective
X
Mechanical seal / stuffing box leaky
X
Shaft sleeve (if present) worn
X
X
Imbalance of the impeller
Remedy
• Check system for contaminants
• Reset the duty point
• Bleed pump and fill suction line
• Correct the fluid level
• Minimize resistances in the suction
line
• Clean filter
• Reduce suction head by installing
the pump lower
• Exchange worn stationary wear ring
• Change the motor connection
phases
• Replace seal
• Check suction line
• Remove clog
• Clean pump
• Change the pipe layout or install a
bleed valve
• Increase frequency in the permissi-
ble range
• Check voltage
• Check phases and fuses
the impeller
• Check the pump dimensioning
(consult with the manufacturer)
• Correct the pump installation
• Lower speed
• Correct alignment
• Clean the relief bores in the impeller
• Check the condition of the station-
ary wear rings
• Check bearing, exchange bearing
• Correct the coupling distance
• Maintain recommended minimum
flow rate
• Check tightening torque
• Replace seal
• Replace the mechanical seal
• Tighten the stuffing box or repack
• Replace the shaft sleeve
• Repack the stuffing box
• Rebalance the impeller
WILO SE 07/2013
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