Install Instructions

10 Faults, causes and remedies
If the fault cannot be remedied, please contact your local sanitary and heating specialist or
WILO customer services.
11 Spare parts
All spare parts must be ordered through your local specialist and/or Wilo Customer Services.
In order to avoid returns and incorrect orders, please specify the name plate data for all orders.
ENGLISH
9
WARNING!
Electrical shock hazard
Dangers caused by electrical energy must be excluded.
All electrical work must be performed after the electrical supply has been switched
off and secured against unauthorized switching.
WARNING!
Risk of scalding
At high water temperatures and system pressure close isolating valves before and
after the pump. First, allow pump to cool down.
Problem Causes Remedy
Pump is switched Electrical defect / Check /replace the fuse
on but fails to run fuse is blown 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 Switch ground fault interrupter back on.
rupter has triggered 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, Check and if necessary rectify that the rotor
shaft
e.g. by deposits from still rotates freely:
the heating water
- Remove the vent plug,
- insert a flat 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 flow is too Decrease the pump output switch to a lower
high speed
The pump head too Check speed setting, if necessary switch to a lo
high wer speed
Noise in the pump Air in the pump Vent the pump (see chapter 8.1)
Cavitation due to Increase system pressure within the permissible
insufficient inlet range
pressure