Honeywell UDC2800 - Troubleshooting Procedures

Upper
Display
Lower
Display
Indicators
Controller
Output
Probable Cause
Troubleshooting
Procedure
Controller fails to go into “Slave” operation
during communications
Communications
Failure
8
OK Displayed
Output
disagrees
with
Auxiliary
Output
OK Controller
Auxiliary
Output
disagrees
with
Displayed
Auxiliary
Output
Auxiliary Output 9
Other symptoms
If a set of symptoms or prompts other than the one you started with
appears while troubleshooting, re-evaluate the symptoms. This may
lead to a different troubleshooting procedure.
If the symptom still persists, refer to the installation section in this
manual to ensure proper installation and proper use of the controller
in your system.
Troubleshooting Procedures
Introduction
The troubleshooting procedures are listed in numerical order as they
appear in Table "Controller Failure Symptoms". Each procedure lists
what to do if you have that particular failure and how to do it or
where to find the data needed to accomplish the task.
WARNING: TROUBLESHOOTING MAY REQUIRE ACCESS TO
HAZARDOUS LIVE CIRCUITS, AND SHOULD ONLY BE
PERFORMED BY QUALIFIED SERVICE PERSONNEL. MORE
THAN ONE SWITCH MAY BE REQUIRED TO DEENERGIZE UNIT
BEFORE SERVICING.
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Chapter 8 - Troubleshooting/Service