Install Instructions
10 50-13-002-0415
Problem Causes Remedy
Pump is switched on but fails to run
Electrical defect / fuse is blown Check /replace the fuse
Should the fuse blow several times in a row:
• Check the pump for electrical faults
• Check the pump mains cable and electrical connection.
Ground fault inter rupter has triggered Switch ground fault interrupter back on. Should the circuit-breaker trip
several times in a row:
• Check the pump for electrical faults.
• Check the pump mains cable and electrical connection.
Capacitor defect Replace capacitor (observe name plate data)
Motor is blocked,
e.g. by deposits from the heating water
Check and if necessary rectify that the rotor shaft still rotates freely:
• Remove the vent plug,
• Insert a at head screwdriver into the slot end of the shaft and turn to
ensure free rotation,
• Replace the vent plug.
Noise in the system
Air in the system Vent the system
The pump ow is too high Decrease the pump output switch to a lower speed
The pump head is too high Check speed setting, if necessary switch to a lower speed
Noise in the pump
Air in the pump Vent the pump (see chapter 8.1)
Cavitation due to insufcient inlet
pressure
Increase system pressure within the permissible range
If the fault cannot be remedied, please contact your local sanitary and heating specialist or WILO customer services.