64 / 216
Troubleshooting and fault elimination
2017/04
010-989
Pump is running, the given operating values are not being met
Cause
Remedy
Inlet blocked
Clean feed pipe, gate valve, suction adaptor, suction muff and
suction strainer
Gate valve in the discharge pipe closed
Open gate valve completely
Impeller/propeller blocked or slowed
Switch the pump off, secure it against restart, make impeller/
propeller serviceable again
Incorrect direction of rotation
Swap 2 phases of the mains cable
Air in the system
Check pipes, pressure sheath and/or pump part and vent if
necessary
Pump is pumping against excessive pressure
Check the gate valve in the discharge pipe and open
completely if necessary
Signs of wear
Replace worn parts
Defective hose/pipe
Replace defective parts
Impermissible gas content in the pumping medium
Consult the plant
2-phase running
Have a specialist check the connection and correct if necessary
Excessive drop in the water level during operation
Test supply and capacity of the system, check settings and
function of the level control
Pump is not running smoothly and is noisy
Cause
Remedy
Pump is running in the impermissible operating range
Check pump operating data, correct if necessary and/or adapt
to operating conditions
Suction muff, screen and/or impeller/propeller blocked
Suction muff, screen and/or impeller/propeller blocked
Impeller stiff
Switch the pump off, secure it against restart, make impeller
serviceable again
Impermissible gas content in the pumping medium
Consult the plant
2-phase running
Have a specialist check the connection and correct if necessary
Incorrect direction of rotation
Swap 2 phases of the mains cable
Signs of wear
Replace worn parts
Motor bearing defective
Consult the plant
Pump installed under tension
Check the installation
Leak from the floating-ring type shaft seal
Cause
Remedy
More leaks when running in new floating-ring type shaft
seals
Change the oil
Floating-ring type shaft seal faulty
Replace floating-ring type shaft seal, consult the plant
Further steps for fault elimination
If the points listed here do not help to eliminate the fault, contact Customer Service. They will be able to help as
follows:
• Phone and/or written support by Customer Service
• On-site support through Customer Service
• Inspection or repair of the pump at the plant
Please note that costs may be incurred when certain services provided by Customer Service are used. Customer
Service can give you more detailed information about this.
