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9 Troubleshooting
System faults are distinguished into two general categories:
Faults that are automatically detected by the controller and therefore can be
displayed using error messages
Faults that the controller cannot detect
9.1 Faults with error messages
Error indication in
the display
Possible causes
Measures
Flashing
Sensor cable is inter-
rupted
■
Check cable
Defective sensor
■
Check sensor resistance
and replace sensor if
necessary
Flashing
Short-circuit in the sensor
cable
■
Check cable
Defective sensor
■
Check sensor resistance
and replace sensor if
necessary
Circulation error:
No fl owSFlb
+
Flashing
Additional display
for energy yield
measurement:
SFlb
Error in the pump con-
nection
■
Check wiring
Defective pump
■
Replace pump
Air in the system
■
Deaerate the system
Defective fl ow meter
■
Check whether the fl ow
meter impeller moves
freely when the system
is running (if visible)
Defective connection to
the fl ow meter
■
Check cable
Sensor cable is inter-
rupted
■
Check cable
Defective sensor
■
Check sensor resistance
and replace sensor if
necessary
■
■
