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
ashing
Disruption to sensor ■
cable
Check cable
Sensor defective ■
Check sensor resistance,
replace sensor if neces-
sary
ashing
Short-circuit in sensor ■
cable
Check cable
Sensor defective ■
Check sensor resistance,
replace if necessary
Circulation fault:
no ow-through
+
ashing
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
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