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10 Faults, causes and remedies
WARNING!
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!
At high water temperatures and system pressure close isolating valves before and
after the pump. First, allow pump to cool down.
Problem
Pump is switched
on but fails to run
Noise in the system Air in the system
Noise in the pump
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.
Electrical shock hazard
Risk of scalding
Causes
Electrical defect /
fuse is blown
Ground fault inter
rupter has triggered
Capacitor defect
Motor is blocked,
e.g. by deposits from still rotates freely:
the heating water
The pump flow is too Decrease the pump output switch to a lower
high
The pump head too
high
Air in the pump
Cavitation due to
insufficient inlet
pressure
Remedy
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.
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.
Replace capacitor (observe name plate data)
Check and if necessary rectify that the rotor
shaft
- 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.
Vent the system
speed
Check speed setting, if necessary switch to a lo
wer speed
Vent the pump (see chapter 8.1)
Increase system pressure within the permissible
range
ENGLISH
9
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