en Faults, causes and remedies
18 WILO SE 02/2022
WARNING
Risk of injury
Depending on the operating conditions of the pump or the installation (the temper-
ature of the discharged liquid and the volume flow), the pump assembly including
the motor may become extremely hot. There is a real risk of burns when coming into
contact with the pump.
ƒ No special maintenance required during operation.
ƒ Pumps that are not being used during periods of frost should be drained to avoid
damage.
Close the gate valves, fully open the drainage and filler screws (Fig.1, pos.3 and 4)
and empty the pump.
CAUTION
Risk of damaging the pump
Observe the tightening torques of the filler screw (Fig.1, pos.4) and drain plug
(Fig.1, pos.5).
10 Faults, causes and remedies
WARNING
Risk of electric shock
Danger from electrical current must be eliminated. Ensure that the pump’s power
supply is switched off and secured against unauthorised reactivation before per-
forming any work on the electric system.
WARNING
Risk of burns
In case of high water temperatures and high system pressures, close the guard
valves upstream and downstream of the pump. First, allow pump to cool down.
WARNING
Risk of injury
Depending on the operating conditions of the pump or the installation (the temper-
ature of the discharged liquid and the volume flow), the pump assembly including
the motor may become extremely hot. There is a real risk of burns when coming into
contact with the pump.
Faults Causes Remedies
The pump is not functioning No electrical power supply Check fuses, switches and wiring
The motor protection device has cut off the
power
Eliminate any motor overload
The pump operates but does not
discharge any fluid
Wrong direction of rotation Swap 2phases in the power supply
The piping or parts of the pump are obstructed
by foreign matter
Check and clean the piping and the pump
Presence of air in the suction pipe Make the suction pipe air-tight
Suction pipe too narrow Install wider suction pipe
The pressure at the pump inlet is insufficient Review the installation conditions and recom-
mendations described in this manual
The pump discharges irregularly The suction pipe has a smaller diameter than
that of the pump
The suction pipe must have the same diameter
as the pump suction opening
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