Faults, Causes And Remedies; Spare Parts - Wilo VBH 150 L Notice De Montage Et De Mise En Service

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10 Faults, causes and remedies

Faults
Low water level triggering at the pres-
sure boosting system, even though tank
is filled
Low water level triggering at the pres-
sure boosting system, even though
replenishment is taking place
Air in the pressure boosting system
pumps
Cavitation noise in the pumps
No water in the pressure boosting sys-
tem, even though tank is filled
No water is replenished to replace the
volume extracted by the pressure boost-
ing system
Water escapes from the overflow
Water escapes from the ventilation con-
nection
If the operating fault cannot be remedied,
please consult specialist technicians or the
nearest Wilo after-sales service point or repre-
sentative.

11 Spare parts

Spare parts or repairs may be ordered from local
specialist technicians and/or the Wilo after-sales
service.
To avoid queries and incorrect orders, all data on
the name plate should be submitted with each
order.
Subject to change without prior notice!
22
Causes
Float switch connected incorrectly
Floater on the float switch blocked/
jammed
Float switch defective
Replenishment amount through the inlet
valve too low
Flow pressure at the inlet valve too low
Inlet valve defective
Draw-off connection or connection to
pressure boosting system not tight
Cross-section of the connection line
between tank and pressure boosting
system too small
Check valve between break tank and
pressure boosting system closed
Draw-off connection or connection with
the pressure boosting system
obstructed
Check valve closed upstream from the
inlet valve
Inlet valve obstructed
Inlet valve defective
Inlet valve incorrectly adjusted
Inlet valve defective
Overflow connection obstructed and
inlet valve defective
Remedies
Check the float switch connection (see
Fig. 7 and wiring diagram of the pressure
boosting system control unit)
Check float switch
Replace float switch
Increase inlet amount
Enlarge the cross-section of the inlet
pipe
Replace inlet valve
Seal connections
Adjust the connection line (enlarge
diameter)
Open the check valve
Remedy the obstruction
Open the check valve
Remedy the obstruction
Replace inlet valve
Check and correct the inlet valve setting
Replace inlet valve
Remedy obstruction, replace inlet valve
Wilo SE 07/2015