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2.1
Overview
A comprehensive understanding of the operation of the ECUA06 is a prerequisite to troubleshooting.
Industrial Climate Engineering
from the factory. Of course, it is possible that a defect may escape undetected, or damage may have
occurred during transportation. However, the great majority of problems result from installation errors.
If you experience difficulties with the ECUA06, please review the installation steps in Chapter 1. It
may be helpful to get another person to review and check them with you.
Much time can be saved by taking a thoughtful and orderly approach to troubleshooting. Start with a
visual check - are there loose wires, crimped tubing, missing parts, etc? Begin deeper analysis only
after making this initial inspection.
The troubleshooting information in this manual is basic. The troubleshooting section contains prob-
lem/solution charts for general problems, followed by a compressor section.
Not every problem can be anticipated. If you discover a problem that is not covered in this manual, we
would be very grateful if you would bring it to the attention of our service department for incorporation
in future revisions.
As always, please exercise caution and good judgement when servicing the MiniPac™ ECU. Use
only safe and proven service techniques. Use refrigeration goggles when servicing the refrigeration
circuit.
The refrigerant circuit has hot surfaces, and the electrical voltages inside of the unit may be hazard-
ous or lethal. SERVICE MAY BE PERFORMED ONLY BY QUALIFIED AND EXPERIENCED
PERSONS.
The refrigerant circuit has hot surfaces, and the electrical voltages inside of
the unit may be hazardous or lethal. SERVICE MAY BE PERFORMED ONLY BY
QUALIFIED AND EXPERIENCED PERSONS.
2.2
Failure Symptoms Guide
PROBLEM/SYMPTOM
A. Unit does not run.
NOTE:
An internal anti-short-cycle
timer will prevent the unit
from starting for .2 to 8
minutes following start-up.
Chapter 2 Troubleshooting
's MiniPac™ ECUs are thoroughly tested before they are shipped
™
WARNING
LIKELY CAUSE(S)
1. Power supply problem.
2. Shut off by external thermostat or
thermostat is defective.
3. Unit off on high or low pressure limit.
4. Internal component or connection
failure.
21
CORRECTION
1. Check power supply for adequate phase and voltage.
Check wiring to unit and external breakers or fuses.
2. Check operation of wall-mounted thermostat.
3. Reset pressure switch.
4. Check for loose wiring. Check components for failure.
ECUA06 7/2014 new
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Table of Contents
Troubleshooting
