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90 WILO SE 10/2013
*) Only for pumps with P1 800W
Table 10.2: Warning signals
If the operating fault cannot be remedied, please consult skilled craft firms
or the nearest Wilo customer service point or representative.
E50 Bus commu-
nication
fault
Interface, core defective,
IF Modules not connected
properly, cable defective
The control system is
switched to local control
mode via the interface
after 5 minutes
E51 Invalid
master/slave
combination
Different pumps Single pumps:Use the
same pump types.
Double pump: Request
customer service or read
the pump type at MA and
SL using an IR device. If the
module types deviate,
request the corresponding
replacement module
E52 Master/slave
communica-
tion error
IF Modules not correctly
plugged in, cable defec-
tive
The modules switch over
to single pump operation
after 5 s. Plug modules
back in, check cables
E53 Invalid bus
address
Same bus address
assigned twice
Carry out addressing on
the module once again
E54 I/O module
connection
I/O module connection
interrupted
Check connection
MA Master/slave
not set
Define the master and
slave
Code
no.
Symbol
flashing
Fault Cause Remedy
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