40
English
WILO SE 09/2021
Operating faults
If the fluid is toxic, corrosive or hazardous for
personnel, then WILO or the authorised repair
company must be informed of the situation.
Clean the pump in such cases in order to ensure
absolute safety for the craftsmen performing
the repairs.
If the pump is at a complete standstill and an intervention is required, disconnect the power supply, wait until the LEDs have gone out completely, eliminate the fault
and reconnect the power supply. If a major fault is present, then an after-sales service employee must be called in.
If the operating fault cannot be rectified, then please
contact your local professional tradesmen or the Wilo
after-sales service in your vicinity.
ATTENTION!
Display Frequency converter behaviour
Fault/possible causes Elimination
Green
Led
Red
Led
Reaction time
up to standstill
Frequency
converter
Number of
automatic
re-start
Waiting time
before
switching
back on
Relay status
Contact –
Failure contact
Off On
Immediate
3 60 s Open
Frequency converter supply
has undervoltage
Check voltage at the
terminals of the frequency
converter
Off On
Immediate
3 60 s Open
Frequency converter supply
has overervoltage
Check voltage at the
terminals of the frequency
converter
Off On
Immediate
3 60 s Open The motor has a shortcircuit
Dismantle motor/
frequency converter of the
pump and have it checked
or replace it
Off On < 60 s 3 60 s Open The pump is overloaded
Excessive density and/or
viscosity of the pumped
uid
Off On < 15 s 0 / Open
The pump is deactivated or is
running dry
Re-prime by lling
the pump. Check the
impermeability of the foot
valve
Off On < 60 s
3
60 s Open
The sensor cable (4-20 mA) is
disconnected (only Mode 2)
Check correct current
supply and cabling of the
sensor
De-energise the pump before each intervention and secure against non-authorised restarts!
All of the incidents listed below will lead to a switch-off via the error relay
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