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9 Maintenance/service
All servicing should be performed by an authorized service representative!
Warning! Electrical shock hazard
Dangers caused by electrical energy must be avoided.
All electrical work must be performed after the electrical supply has been
disconnected 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.
These pumps are maintenance free, self-lubricated by the system fluid, and
have no seals to leak or couplings to break.
CAUTION! Possible damage of the pump
If the motor head is separated from the pump housing for servicing or repair
work, the O-ring situated between the motor head and pump housing must
be replace by a new one. When refitting the motor head, make sure the O-
ring is positioned correctly.
10 Faults, causes and remedies
For faults, causes, and remedies see "Error / Warning Messages" flow chart and
the tables below.
The first column in the table lists the code numbers shown by the display in the
event of an error.
Most error displays disappear automatically once the cause of the error has been
remedied.
10.1 Error messages
An error has occurred. The pump shuts down, the error LED (red permanent
light) comes on. After 5 minutes the pump switches on automatically. Only
when the same error occurs for the 6th time within 24 hours does the pump
shut down permanently, the FC relay opens. Manual reset is necessary.
NOTE: Exception: With blocking code no. "E10" and "E25" the unit immediately
shuts down on the first occurrence.
10.2 Warning messages
The problem (only Warning) is displayed, but the FC relay does not come into
action. The pump continues to run. The error can occur an infinite number of
times. The indicated operating condition should not be ignored for long periods
of time. The cause of the error must be removed.
NOTE: Exception: If errors "E04", and "E05" remain for more than 5 minutes,
these are passed on as error readings (see diagram).
32
Subject to technical alterations!
WILO AG 05/2007
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