34 | Troubleshooting Guide Ultra Low Temperature Freezers
Troubleshooting Guide
This section is a guide to troubleshooting general operational problems.
Problem Cause Solution
Unit warming.
Unit set to –80 °C but
cannot make temperature
(Not reaching setpoint).
Unit recovers slowly to
setpoint.
Warm load / Overload.
Allow ample time to recover from loading warm product.
Do not overload cabinet.
Refer to Initial Loading
in user manual for loading
procedures.
Hot environment.
Check, if the location meets ambient requirements
(within 32 °C to 40 °C or 90 °F to 104 °F) and away from hot
objects.
Dirty condenser and
condenser filter.
Clean condenser and filter. Refer to Cleaning the Exterior
and Cleaning the Condenser Filter in user manual.
Not enough space for air
circulation.
Install the unit in a level area free from vibration with a
minimum of 8 inches (20 cm) of space on the top and sides,
6 inches (15 cm) in back.
Icing/Frost due to high
relative humidity.
Check if the location meets requirements. Maximum relative
humidity 60% for temperatures within 15 °C to 32 °C
(59 °F to 90 °F).
Excess frost build-up in
chamber.
Defrost the unit. Refer to Defrosting the Freezer in user
manual.
Frost build-up on outer
door gasket.
Wipe with a soft cloth or cryo-gloved hand.
Gasket damage.
Check for punctures or tears on gasket. Replace if necessary.
Refer to Gasket Maintenance in user manual.
Prolonged door openings.
Avoid opening of door for longer duration. Allow ample time
for recovery after door opening.
Inadequate power supply.
Check for proper voltage and currents are supplied to the
unit.
User interface (Display)
failure.
Breaker switch off.
Check circuit breaker and reset to on position. Always use a
dedicated, properly grounded circuit.
User interface not
powered on. Unit power
failure.
Push power button on user interface and hold for at least
1 second.
Unit power failure Apply proper power to the unit.
Unit is ON but display is
showing empty.
User interface not
powered on.
Push power button on user interface and hold for at least
1 second. Try touching the screen.
Try restarting the unit manually by flipping the breaker at the
front of the unit. If this does not work, call service.
Display is looking dull.
Screen brightness is too
low.
From the settings screen, pressing the display button will
show the display.
Adjust the brightness level of the display (Refer to Users).
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