Wilo Stratos PICO-Z Serie Instrucciones De Instalación Y Funcionamiento página 37

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