20
M
od
Pac II, 9/09-15
Troubleshooting
4.1 Overview
A comprehensive understanding of the operation of the M
od
Pac II™ air conditioner is a prereq-
uisite to troubleshooting. Please read the Chapter 1 for basic information about the unit.
Marvair
®
M
od
Pac II™ air conditioners are thoroughly tested before they are shipped 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 M
od
Pac II™ A/C, please review the installation steps in
Chapter 2.
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
problem / 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 M
od
Pac II™ A/C.
Use only safe and proven service techniques. Use safety goggles when servicing the refrigeration
circuit.
WARNING
The refrigerant circuit has hot surfaces, and the electrical voltages inside of the
unit may be hazardous or lethal. SERVICE SHOULD BE PERFORMED ONLY BY
QUALIFIED AND EXPERIENCED PERSONS.
