Troubleshooting Procedures; Procedure #1 - Honeywell UDC2800 Product Manual

Upper Lower
Display Display
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.
Equipment needed
You will need the following equipment in order to troubleshoot the
symptoms listed in the tables that follow:
n
n

Procedure #1

This table explains how to troubleshoot power failure symptoms.
Controller
Indicators
Output
Output
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.
Multimeter – Capable of measuring millivolts, milliamps and
resistance.
Calibration sources – T/C, mV, Volt, etc.
Chapter 8 - Troubleshooting/Service
Troubleshooting
Probable Cause
Procedure
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