Series 8 C300 Controller User's Guide 
Honeywell 
 
 
 
 
 
 
 
 
 
10. C300 Controller Troubleshooting 
10.1 
Overview 
This chapter provides guidance and background information about the causes and 
remedies for failures which may occur in the C300 Controller. The following table 
provides the sections covered in this chapter. Click the topic to view it 
 
What to do when faults occur 
Checking Control Builder error code reference 
Checking faceplate display and LEDs 
Using CTools utility to capture diagnostic data 
C300 Controller Soft Failures 
IOLINK Block Soft Failures 
Additional status and fault messages 
Communications and system time faults during startup 
Gathering information for reporting problems to Honeywell 
Getting further assistance