13
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 flow
+
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 flow meter
◼
Check whether the flow
meter impeller moves
freely when the system is
running (if visible)
Defective connection to
◼
the flow meter
Check cable
Sensor cable is inter-
◼
rupted
Check cable
Defective sensor
◼
Check sensor resistance
and replace sensor if
necessary
