Thermo Scientific TDE Series Manual page 27

Problem
Power failure to the unit.
Unit tripping the circuit
breaker.
Excessive frost build-up
around perimeter of door.
Unit is over cooling.
22 | Troubleshooting Guide
Cause
Electromagnetic fields
For any other reason:
Power supply stopped/
Breaker switch off.
Shared power source.
Unit plugged into wrong
power outlet.
Unit not grounded.
Use of extended cords.
Icing/Frost due to high
relative humidity.
Excessive and prolonged
lid openings.
Gasket damage.
Set points may have
changed.
Temperature offset may
have changed.
Unknown.
Solution
Call service.
The freezer continues to maintain its set temperature
Contact service person
we recommend the use of a redundant and independent
temperature monitoring system and that freezer be
monitored 24/7 for performance commensurate with the
value of product stored.
Remote alarm continues to function and it provides any
alarm as needed when temperature changes or power
outage or door ajar. Connect the remote alarm to
monitor the alarms on the unit.
Confirm that the cord is securely plugged in.
Plug another appliance into the outlet to see if power is
present.
Always use a dedicated, properly grounded circuit.
Never connect unit to overloaded power source. Always
use a dedicated (separate) circuit.
Plug the unit into proper power source to deliver correct
voltage.
Your unit must be properly grounded in conformity with
national and local electrical codes. Troubleshooting
procedures involving live voltage is dangerous and if
done improperly can result in injury and/or death. This
troubleshooting should be performed by trained
personnel only.
Do not use an extension cord. Make sure the unit
supplied power cord is plugged directly into power outlet.
Check if the location meets requirements. Maximum
relative humidity 60% for temperatures within
15°C to 32°C (59°F to 90°F).
Occasionally scrape the ice on the lid.
Be careful not to puncture the rubber gasket.
Avoid opening lid for a prolonged time.
Check for punctures or tears on gasket. If replacement is
necessary, call service. Refer Gasket Maintenance in
user manual.
Adjust the setpoint to run at desired setpoint under
settings.
Try adjusting the offset. Temperature offset can be set by
accessing the settings menu via the settings button.
Try re-starting the unit. If this doesn't help call service.
Thermo Fisher Scientific ULT Freezers