Fixing common problems
Loss of power
R301.1 Experion C300 Controller User's Guide 221
11/06 Honeywell
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
The C300 Controller Power-On Self Test (POST) has detected a fault.
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
operation to continue.
Solution
Short the reset pads on the IOTA to re-start the C300 Controller. If error
persists, replace the controller module. See C300 Controller module and
IOTA replacement for details.
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