38 | 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 can’t
make temperature (Not
reaching set point).
Unit recovers slowly to set
point.
Warm load / Overload.
Allow ample time to recover from loading warm product.
Do not overload cabinet.
Refer Initial Loading
in user manual for loading procedures.
Hot environment.
Check, if the location meets ambient requirements (within
15°C to 32°C or 59°F to 90°F) and away from hot objects.
Dirty condenser and
condenser filter.
Clean condenser and filter. Refer Cleaning the Condenser
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 Defrosting the Freezer in user
manual.
Frost build-up on outer
door gasket.
Occasionally scrape the ice on the gasket.
Gasket damage.
Check for punctures or tears on gasket. Replace if necessary.
Refer 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 to the unit.
Either of the compressors
are not working.
Call service.
Refrigerant is insufficient. Call service.
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.
Push power button on user interface and hold for at least
1 second.
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
rear of the unit. If this doesn’t work, call service.
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