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Operating Manual:
ULT25NE 10327.1 | 12.22.2016 www.stirlingultracold.com
7. Troubleshooting
Problem Possible Cause Solution
Freezer does
not power on
Power is not getting
to the freezer from
the AC input
Check the connections to the power supply
Assure that the wall plug is firmly seated
Power is not getting
to the freezer from
the DC input
Reseat the connections to the DC power cord
Assure that the DC input has live power
Remove any dirt or debris inside the DC socket or
on the plug
Replace any blown automobile fuses
Freezer does
not achieve
desired
temperature
Inadequate
air circulation
Clean air filter screen
Remove air flow obstructions
Inadequate power
Assure that the wall plug is firmly seated
Remove any dirt or debris inside the automotive
DC socket or on the plug
Operate freezer only when automobile is running
Improper
environment
Remove freezer from direct sunlight, hot room, etc.
Check that freezer is level. Tilts of more than 12
degrees in some directions will degrade performance.
Freezer cools
slowly
Overloading
of freezer
Remove some items from freezer
Lid is not
completely closed
Check for ice buildup, remove if necessary,
and properly close lid
Lid is open and
closed too often
Minimize opening and closing of lid
Inadequate
air circulation
Clean filter and unblock air vents
12V plug
becomes
unusually hot
Dirt or corrosion in
the DC socket
Clean the socket
5-7. Errors, Maintenance and Troubleshooting
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