Problems, Causes And Solutions - Wilo Multivert MVI 16 Series Installation And Operating Instructions Manual

8 Problems, Causes and Solutions

Problem
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 your nearest WILO customer services or
representative.
Subject to technical alterations!
Cause
no power
motor safety switch activated
Incorrect 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
Solutions
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
ENGLISH
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