Faults, Causes And Remedies - Wilo HiMulti 3 H Serie Einbau- Und Betriebsanleitung

• The gas supply pressure (PN2) should approxi-
mately correspond to the pump switch-on pres-
sure (pI) less 0.2-0.5 bar or 10% of the pump
switch-on pressure (pI) (see Table 1), replenish to
correct. When replenishing, we recommend using
nitrogen because this gas minimises the risk of
corrosion in the tank.
• Check the pump for leaks.
• Clean and maintain filters installed as accessories
regularly (in accordance with the corresponding
installation and operating instructions).
Afterwards, commission the domestic water
system (see section 8).
Faults
Motor does not run
Pump is running but not pumping
Pump is not pumping evenly
Pressure is not adequate
Pump vibrating
Installation and operating instructions Wilo domestic water systems HiMulti3..H.. /HMHI/HWJ
Causes
No mains voltage
Fuse defective
Motor protection tripped
Pump not running smoothly
Pump blocked
Dry-running protection tripped, water
level too low
Pump defective
Incorrect direction of rotation
Supply voltage too low
Pipe or parts of the pump are blocked by
foreign objects
Air in suction port
Air in the pump
Inlet pipe or suction line too narrow
Immersion depth of the foot valve too
low
Suction head too large
Incorrect pump selected
Incorrect direction of rotation
Flow rate too low, inlet pipe or filter
blocked
Shut-off device not opened sufficiently
Foreign object is blocking the pump
Foreign object in the pump
Pump not running smoothly
Cable terminals loose
Pump not adequately secured to the
tank
Bearing surface is not solid enough

10 Faults, causes and remedies

Faults, particularly those affecting the pumps or
the control system, should only be remedied by
Wilo's customer service or a specialist company.
NOTE:
The general safety instructions must be observed
during any maintenance or repair work.
Also follow the installation and operating instruc-
tions of the pumps and the control device or any
accessories present.
Remedy
Check fuses, float switch and cable
Replace fuse
Remedy motor overload
Remedy pump clogging
Remedy blockage of the pump
Check water level and correct
Replace pump
DM version: Swap 2 phases of the mains
connection
EM version: contact customer service
Check mains voltage, capacitor and
cables
Check and clean pipe and pump
Seal inlet pipe
Fill the pump again
Install an inlet pipe or suction line with
a larger nominal diameter
Increase immersion depth of the foot
valve
Position pump lower
Install a more powerful pump
DM version: Swap 2 phases of the mains
connection
EM version: contact customer service
Clean filter and inlet pipe
Open shut-off device
Clean pump
Remove the foreign object
Check smooth running of the pump/
motor
Check cable terminals of the motor
and secure
Tighten fastening screws
Stabilise the bearing surface
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