Honeywell C300 - Device Index Value Is Zero Upon Power up

10. C300 Controller Troubleshooting
10.4. Fixing common problems
242
Series 8 C300 Controller User's Guide
Honeywell
R500
April 2017
Device Index value is zero upon power up
The controller's 4-character display shows a Device Index value of zero (#000).
Diagnostic Check
Be sure Device Index switches on the IOTA were not intentionally set to
zero to initiate a Device Index/IP Address reset.
Cause 1
Device Index switches set to zero.
Solution
Change Device Index switches to correct setting. Refer to the section
Res et Device Index and IP address of controller for more information.
Cause 2
The controller module is defective.
Solution
Replace the controller. Refer to the section C300 Controller module and
IOTA replacement for details.
If Device Index switch setting matches Device Index number in 4-
character display upon controller power up, the removed controller is
defective. Otherwise, proceed to Cause 3.
Cause 3
The IOTA is defective.
Solution
Replace the IOTA. Refer to the section C300 Controller module and
IOTA replacement for details.
If Device Index switch setting matches Device Index number in 4-
character display upon controller power up, the removed IOTA is
defective.