Wilo Stratos PICO-Z, Installation And Operating Manual, Page: 37 / 201

Installation and operating instructions Wilo-Stratos PICO-Z 37
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9 Troubleshooting
Only allow qualified electricians to remedy faults on the
electrical system.
Only allow qualified specialist technicians to do other
troubleshooting and repair work.
Faults Causes Remedy
Pump is not run-
ning although
the power sup-
ply is switched
on Electrical fuse
defective Check fuses
Pump has no
voltage Resolve the power interruption
Pump is running
but there is no
circulation Circulation pipe is
not filled/vented Fill and vent the circulation pipe
Pump making
noises Cavitation due to
insufficient suction
pressure Increase the system pressure within
the permissible range
Check the delivery head and set it to
a lower head if necessary
Pump is not
reaching the set
minimum tem-
perature Storage tank tem-
perature too low Check storage tank temperature and
increase if necessary
Taps opened Close taps and check if the pump
reaches the minimum temperature
then
Cold water flowing
into the circulation
pipe Install non-return valves
Excessive heat
losses because
piping is not ade-
quately insulated Insulate piping or check the insula-
tion