15
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 mes-
■
sages 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
Fault in pump connection
■
Check cabling
Pump defective
■
Replace pump
Air in the system
■
Vent system
Disruption to sensor
■
cable
Check cable
Sensor defective
■
Check sensor resistance,
replace sensor if neces-
sary
