Wilo Rexa UNI Series, Installation And Operating Instructions Manual, Page: 55 / 776

Faults, causes and remedies en
Installation and operating instructions Wilo-Rexa UNI 55
⇒ Have the voltage of individual phases checked by a
qualified electrician. Contact the electricity distribu-
tion network.
5. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified elec-
trician.
6. Increased power consumption through jammed hydraul-
ics.
⇒ Clean the hydraulics and check the inlet.
7. The density of the fluid is too high.
⇒ Contact customer service.
Fault: Pump runs, there is no volume flow
1. There is no fluid.
⇒ Check the inlet, open all gate valves.
2. Inlet clogged.
⇒ Check the inlet and remove clogging.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Pipe system on the pressure side or pressure hose
clogged.
⇒ Remove clogging and replace the damaged com-
ponents if necessary.
5. Intermittent operation.
⇒ Check the switching system.
Fault: Pump starts, duty point is not reached
1. Inlet clogged.
⇒ Check the inlet and remove clogging.
2. Slide valves on the pressure side closed.
⇒ Open all gate valves completely.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified elec-
trician.
5. Air cushion in the pipe system.
⇒ Vent the pipe system.
⇒ If air cushions occur frequently: Locate and prevent
the air intake, if required install ventilation systems
at specified locations.
6. Pump pumping against excessive pressure.
⇒ Open all gate valves on the pressure side com-
pletely.
⇒ Check the impeller shape, use other impeller shapes
if required. Contact customer service.
7. Signs of wear on the hydraulics.
⇒ Have the components (impeller, suction port, pump
housing) checked and replaced by customer service.
8. Pipe system on the pressure side or pressure hose
clogged.
⇒ Remove clogging and replace the damaged com-
ponents if necessary.
9. Strongly gassing fluid.
⇒ Contact customer service.
10.There are only two phases at the connection.
⇒ Have the connection checked and corrected by a
qualified electrician.
11.Excessive decrease in the fill level during operation.
⇒ Check supply/capacity of the system.
⇒ Have the switching points of the level control
checked and adjusted if necessary.
Fault: The pump does not run smoothly and is noisy
1. Improper duty point.
⇒ Check the pump configuration and the duty point,
contact customer service.
2. Hydraulics jammed.
⇒ Clean the hydraulics.
3. Strongly gassing fluid.
⇒ Contact customer service.
4. There are only two phases at the connection.
⇒ Have the connection checked and corrected by a
qualified electrician.
5. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified elec-
trician.
6. Signs of wear on the hydraulics.
⇒ Have the components (impeller, suction port, pump
housing) checked and replaced by customer service.
7. Motor bearings have worn.
⇒ Inform customer service; send the pump back to the
factory for overhauling.
8. Pump is installed under tension.
⇒ Check installation, install rubber compensators if
necessary.
Further steps for troubleshooting
If the points listed here do not rectify the fault, contact
customer service. Customer service can assist in the fol-
lowing ways:
▪ Telephone or written support.
▪ On-site support.
▪ Inspection and repair at the factory.