63
WARNING! After the restart, the LED display shows the previously set values of the pump.
Lock/unlock the button
- To activate the key lock, press and hold the operating button for 8 seconds until the LEDs for the selected setting briefly flash,
then release.
- LEDs flash constantly at 1-second intervals.
- The key lock is activated: pump settings can no longer be changed.
- The key lock is deactivated in the same manner as it is activated.
Figure 65 - Lock/unlock the button
Activating factory setting
- The factory setting is activated by pressing and holding the operating button whilst switching off the pump.
- Press and hold the operating button for at least 4 seconds.
- All LEDs flash for 1 second.
- The LEDs for the last setting flash for 1 second.
- When the pump is switched on again, the pump runs using the factory settings (delivery condition).
Faults, Causes and Solutions
The following tables show some of the problems of installing Wilo pumps.
Faults Causes Solutions
Pump is not running although
the power supply is switched
on
No voltage supply at pump
Rectify the power
interruption
Noisy pump
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
Building does not warm up
Thermal output of the heating
surfaces is too low
Increase setpoint
Table 10 - List of faults and solutions
LED
Faults Causes Solutions
Lights up red
Bloc
king
Rotor bloc
ked
Activate manual
restart or contact
customer service
Contacti
ng
/w
inding
Winding defective
Figure 64 - Manual restart
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