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12
9 Troubleshooting
In principle, all system errors can be placed in one of two categories:
Faults that the controller can detect automatically and for which error messages
◼
can be shown
Faults that cannot be reported by the controller
◼
9.1 Faults with error messages
Error displayed
on-screen
Possible causes
Action to take
flashing
Disruption to sensor cable
◼
Check cable
Sensor defective
◼
Check sensor resistance,
replace sensor if neces-
sary
flashing
Short-circuit in sensor
◼
cable
Check cable
Sensor defective
◼
Check sensor resistance,
replace if necessary
Circulation fault:
no flow-through
+
flashing
Also displayed
with energy yield
measurement
:
Fault in pump connection
◼
Check cabling
Pump defective
◼
Replace pump
Air in the system
◼
Vent system
Flow meter defective
◼
If visible, check whether
the flywheel of the
meter moves when the
system is running
Connection to flow meter
◼
defective
Check cable
Disruption to sensor cable
◼
Check cable
Sensor defective
◼
Check sensor resistance,
replace sensor if neces-
sary