Honeywell C300 - Fixing Common Problems

R500
April 2017
Series 8 C300 Controller User's Guide
Honeywell
235
10. C300 Controller Troubleshooting
10.4. Fixing common problems
10.4 Fixing common problems
This section identifies some common problems and describes how you might fix them.
Loss of power
The power supply has failed or the main power source has been shut down or is
experiencing a brownout or blackout condition.
Diagnostic Check
 The 4-character display on the C300 Controller and LEDs on the
controller module and the IOTA are off.
 In the Monitoring tab, the C300 Controller icon turns red.
Cause 1
Main power source has been disconnected or shut down either manually
or temporarily by brownout or blackout condition.
Solution
Re-connect the main power source or turn it On or wait for temporary
brownout or blackout condition to pass.
Cause 2
The 24 Vdc power supply failed or power cable has been disconnected
or failed.
Solution
Replace the 24 Vdc power supply or re-connect/replace the power cable.
Cause 3
Power fuse opens on IOTA.
Solution
Replace power fuse.
Power-On Self Test (POST) does not complete
A fault is detected during the Power-On Self Test (POST).
Diagnostic Check
A self test diagnostic code remains on display and the POST does not
continue.
Possible indications: Display shows test pattern, or Tnnn (nnn = a test
number which is executed during POST).
Note that if display shows 'T499' POST has completed.
Cause
The C300 Controller POST has detected a failure that does not allow
startup to continue or complete.
Solution
Short the reset pads on the IOTA to re-start the C300 Controller. If error
persists, replace the controller module. Refer to the section C300
Controller module and IOTA replacement for details.