Problems, Causes And Remedies - Wilo Drain TM 32/7 Notice De Montage Et De Mise En Service

8. Problems, Causes and Remedies

Problem
Pump does not run
or stops during the
operation
Pump does not start
up/cut out
Pump does not pump
Capacity drops during
operation
If the fault cannot be remedied, please contact your plumbing and heating specialist or your nearest
Wilo customer services or representative.
Cause
Power interrupted
Motor safety switch
disengaged
Fluid temperature too high
Pump silted up or blocked
Float switch blocked or cannot
move freely
Air in the pump (vent hole/slit
clogged up)
Air trapped in the unit cannot
escape
Water level below the suction
opening
Non-return device jammed in
pressure support
Hose bent/shut-off valve
closed
Suction strainer clogged
up/impeller blocked
Remedies
check fuses, cables and connections
Allow pump to cool, starts again
automatically
Allow to cool
Disconnect the pump from the mains and
remove it from the shaft
Dismantle suction strainer / whirl device,
rinse suction strainer / impeller under running
water.
Check float switch and ensure it can move
Disconnect the pump from the mains and
remove it from the shaft
Dismantle suction strainer / whirl device,
rinse suction strainer / vent slit under running
water. Rinse vent hole in housing.
Vent / if necessary drain unit
Check cut-out level "h1"
If possible submerge pump further
(observe cut-out level)
Check operation
Straighten bend in hose / open shut-off valve
Disconnect the pump from the mains and
remove it from the shaft
Dismantle suction strainer/ whirl device,
rinse suction strainer / impeller under running
water.
ENGLISH
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