Honeywell C300 User Manual page 258

10. C300 Controller Troubleshooting
10.5. C300 Controller soft failures
Soft Fail Message
Checksum Failure
WDT Hardware Failure
WDT Refresh Warning
Critical Task Watchdog
Warning
Uncorrectable Internal
RAM Sweep Error
246
Condition when indicator is lit
on a subsequent controller restart.
The watchdog timer hardware circuit
is faulty.
The watchdog timer is being
refreshed at a rate which is outside
acceptable limits. Or The watchdog
timer is being refreshed late, but not
late enough for it to expire.
Indicates that one of a number of key
tasks within the controller is
executing less frequently than
expected. Refer to the section
Critical T ask Monitor for more
information.
Test of the RAM location where the
controller's Application Image
executes has detected an
uncorrectable bit error. Possible
hardware failure which may affect
controller operation.
Series 8 C300 Controller User's Guide
Honeywell
Corrective Action

If primary, command a
switchover.

If backup, reboot, reset or
remove and reinsert controller
module. If module does not
fail POST, continue normal
operation.
Re-load the C300 Controller Boot
image. Refer to the section
Upgrading C300 Controller
Firmware for the detailed
procedure.
If failure still persists, replace the
controller module and return faulty
module to the factory.
Replace the controller module and
return faulty module to the factory.
Contact Honeywell TAC.
You may be asked to further
describe operating conditions

Gather controller logs

Capture and provide the
control strategy running in the
controller

Replace the controller
Contact Honeywell TAC.
Note that an alarm associated with
this soft failure will appear
immediately after detection of a
timeout on one of these internal
tasks. The timeout will place the
controller in a FAIL state with a fail
code of 0123.
Replace the controller module and
return faulty module to the factory.
April 2017
R500