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 nec-
essary
Circulation error:
No ow
+
Flashing
Additional display
for energy yield
measurement:
Error in the pump con- ◼
nection
Check wiring
Defective pump ◼
Replace pump
Air in the system ◼
Deaerate the system
Defective ow meter ◼
Check whether the ow
meter impeller moves
freely when the system is
running (if visible)
Defective connection to ◼
the ow meter
Check cable
Sensor cable is inter- ◼
rupted
Check cable
Defective sensor ◼
Check sensor resistance
and replace sensor if
necessary
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