Wilo SiBoost Smart Helix V Series - 10 Faults, Causes and Remedies

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Installation and operating instructions Wilo-SiBoost Smart (FC) ... Helix V/... Helix VE/... Helix EXCEL 43

10 Faults, causes and remedies

Faults, particularly those affecting the pumps or

the control system, should only be remedied by

Wilo customer service or a specialist company.

NOTE!

The general safety instructions must be observed

when doing any maintenance or repair work. Also

follow the installation and operating instructions

of the pumps and the control device.

Fault Cause Remedy

Pump(s) do not start No mains voltage Check fuses, cables and connections

Main switch "OFF" Switch on the main switch

Water level in break tank too low, i.e.

low-water level reached

Check break tank inlet valve/inlet pipe

Low-water level switch has triggered Check intake pressure

Low-water level switch defective Check, if necessary replace the low-

water level switch

Electrodes incorrectly connected or sup-

ply pressure switch incorrectly set

Check installation or setting and correct

Intake pressure exceeds start-up pres-

sure

Check settings and

correct if necessary

Check valve closed at pressure sensor Inspect, open check valve

if necessary

Start-up pressure set too high Check setting and correct if necessary

Fuse defective Check fuses and replace if necessary

Motor protection has triggered Check set values against the pump or

motor data, measure current values and

correct setting if necessary. Check

motor for defects and replace if neces-

sary

Contactor defective Check and replace if necessary

Turn-to-turn fault in motor Check, if necessary replace motor or

have repaired

Pump(s) do not switch off

Intake pressure fluctuates severely Check intake pressure, if necessary take

measures to stabilise supply pressure

(e.g. pressure reducer)

Intake pipe blocked or shut off Check inlet pipe, if necessary remove

blockage or open check valve

Nominal diameter of inlet pipe too small Check the inlet pipe, increase the cross-

section for the inlet pipe if necessary

Inlet pipe incorrectly installed Check inlet pipe, if necessary change

pipe guide

Air in inlet Check, if necessary seal pipe. Vent

pumps

Impellers blocked Check pump, if necessary replace or have

repaired

Non-return valve leaking Check, if necessary replace seal or

replace non-return valve

Non-return valve blocked Check, if necessary remove blockage or

replace non-return valve

Gate valve in system closed or not suf-

ficiently open

Check, open the check valve completely

if necessary

Volume flow too large Check pump data and default values and

correct if necessary

Check valve closed at pressure sensor Inspect, open check valve if necessary

Switch-off pressure set too high Check setting and correct if necessary

Direction of motor rotation false Check the direction of rotation and cor-

rect by changing over the phases if

necessary

Switching frequency too high or flutte-

ring