10. C300 Controller Troubleshooting
10.9. Fault classifications
252
Series 8 C300 Controller User's Guide
Honeywell
R500
April 2017
10.9 Fault classifications
Faults have been classified into a number of categories according to the severity of the
failure. The controller behavior when a failure is detected is determined by type of fault
and whether the controller is non-redundant, or is one of a redundant controller pair.
Table 16 identifies these fault classifications and describes controller behavior in
response to the fault type.
This section also includes more detailed descriptions of these fault classifications, how
these faults are indicated both on the controller faceplate and through other system
displays and corrective actions to clear the faults.
Table 16 C300 Fault Classifications and Possible Causes
Fault Classification
Description
Hard Failure
Hardware detected failure. Operation cannot continue. If software is
running, the affected controller is rebooted into the FAIL State.
Hard failure on a synchronized primary controller triggers a
switchover to the backup controller.
Hard failure on a backup controller causes a loss-of-
synchronization (and reduced availability until fault is corrected).
Hard failure on a non-redundant controller causes a loss-of-
control and loss-of-view.
Severe Failure
Software detected failure. Operation cannot continue. The affected
controller is rebooted into the FAIL State.
Severe failure on a synchronized primary controller triggers a
switchover to the backup controller.
Severe failure on a backup controller causes a loss-of-
synchronization (and reduced availability until fault is corrected).
Severe failure on a non-redundant controller causes a loss-of-
control and loss-of-view.
Partial Failure
Software detected failure. Non-redundant controller could continue to
operate.
Partial failure on a non-redundant controller results in some or all
loss-of-view and/or loss-of-control. However, the controller does
not reboot into FAIL State but continues to provide whatever
services it can.
