Fault Finding, Causes And Remedies - Wilo MVI 1-6 Série Notice De Montage Et De Mise En Service

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8. Fault finding, causes and remedies

Fault
Pump does not run
Pump runs but does not pump
Pump does not pump evenly
Pump vibrates and is noisy
Motor overheats,
motor cut-out activates
If the fault cannot be remedied, please contact your plumbing and
heating specialist or WILO customer services.
Subject to technical alterations.
14
Cause
no power
motor safety switch activated
wrong direction of rotation
pipe or pump components blocked
by foreign body
air in inlet pipe
inlet pipe too narrow
valve not sufficiently open
air in the pump
foreign body in the pump
pump not properly fixed to the base
bearing damaged
one phase interrupted
pump sluggish:
foreign body
bearing damaged
ambient temperature too high
Remedy
check fuses, cables and connections
eliminate motor overload
check direction of rotation and
correct if necessary
check and clean pipe and pump
seal inlet pipe
fit a larger inlet pipe
open valve
bleed the pump
remove foreign body
tighten anchor bolts
consult customer services
check fuses,
cables and connections
clean pump
have pump repaired by
customer services
provide cooling