Lowara LNTSH 65-125/05/S45RCS4 [25/438] The pump unit runs but delivers too little or no liquid

Lowara LNES 100-200/300/W25V CC4 [25/438] The pump unit runs but delivers too little or no liquid
en - Original instructions
25
7.5 The pump unit runs but delivers too
little or no liquid
Cause
Remedy
Motor turns in the wrong
direction
Check the direction of
rotation and change it if
necessary
Incorrect priming (there are
air bubbles in the suction
pipe or in the pump unit)
Repeat the priming
procedure
Cavitation
Increase the NPSH
available in the system
Check valve locked in closed
or partially closed position
Replace the check
valve
Foot check valve locked in
closed or partially closed
position
Replace the foot valve
Flap valve damaged, worn or
faulty (models LNTE and
LNTS)
Replace the flap valve
Delivery pipe throttled
Remove the throttling
Piping and/or pump unit
clogged
Remove the clogging
7.6 The pump unit turns the other way
when turned off
Cause
Remedy
Check valve faulty
Replace the
check valve
Foot check valve faulty
Replace the foot
valve
Flap valve damaged, worn or faulty
(models LNTE and LNTS)
Replace the flap
valve
7.7 The pump unit produces excessive
noise and/or vibrations
Cause
Remedy
Cavitation
Increase the NPSH
available in the system
Unsuitable anchoring to
the ground
Check the anchoring to the
ground
Resonance
Check the installation
Anti-vibration joints not
installed
Install anti-vibration joints on
the suction and delivery
lines of the pump unit
Foreign bodies in the
pump unit
Remove the foreign bodies
Motor bearings worn or
faulty
Replace the motor bearings
The pump unit does not
turn freely due to a
mechanical fault
Send the pump unit to an
authorised workshop for
testing
Motor turns in the wrong
Check the direction of
direction
rotation and change it if
necessary
7.8 The pump starts up too frequently
(automatic start/stop)
Remedy
Repeat the priming
procedure
Replace the check
valve
Replace the foot valve
Replace the flap valve
Adjust or replace the
starter
Pre-charge the
expansion vessel,
or
replace the
expansion vessel
with another
suitable one, or
install an expansion
vessel
Contact Xylem or the
Authorised Distributor
7.9 The pump unit never stops
(automatic start/stop)
Cause
Remedy
The required flow rate is
greater than the one
expected
Reduce the required flow
rate
Delivery pipe leaking
Eliminate the leaks
Motor turns in the wrong
direction
Check the direction of
rotation and change it if
necessary
Pipes, valves or filter
clogged with impurities
Remove the impurities
Starter (pressure switch,
sensor, etc.) set incorrectly,
or faulty
Adjust or replace the
starter
The pump unit runs but
delivers too little or no
liquid
See Par. 7.5

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