40 | Troubleshooting Guide Ultra Low Temperature Freezers
Unit compressors run
continuously.
Freezer set point is low.
Check whether the setpoint is in operating range. Change the
setpoint if necessary.
Frost build up. Defrost the unit. Refer Defrosting the Freezer.
Dirty condenser. Clean the condenser and condenser filter.
Gasket damage.
Check for punctures or tears on gasket. Replace if necessary.
Refer Gasket Maintenance.
Cabinet temperature
reached an alarm
condition, but suitable
alarm is not activated.
Alarm setpoints may be
changed.
Check the present setpoints for temperature alarm
conditions. Change the setpoints if required. Refer Alarms.
Problem with
temperature
validation/calibration.
Cabinet temperature
displayed doesn’t match
with actual temperature.
Customers performing on-site temperature calibration may
observe as much as a 2°C variation when an external probe
is placed next to the freezer control probe. This variation is
normal, due to optimization of control system to ensure
temperature uniformity throughout the cabinet.
Unit is experiencing too
much cabinet
temperature fluctuation
(high uniformity / peak
variation).
Operating mode selected.
Change power mode to high-performance mode to have
tighter peak variation. Refer Controls
.
Unit is constantly
alarming.
Exterior door is closed but
not sealed completely.
Clean any ice build-up on gasket and / or cabinet surface.
Check for punctures or tears on gasket. Replace if necessary.
Refer Gasket Maintenance.
Alarm icons appear on
user interface home
screen.
By pressing red bell or yellow triangle, the ticker message
provides alarm details and recovery details. Refer .
Door open alarm, exterior
door not closing
completely.
Open door completely and immediately close and latch it.
Door open alarm, exterior
door is closed but not
sealed completely.
Defrost exterior door gasket and make sure the door is
completely sealed.
Alarm set points may have
changed.
Change the set points as required. Refer Alarms.
Unit cycle on-
percentage
is increasing.
(Compressors are
running more often than
before.)
Ambient conditions. Unit performance is directly impacted by these causes
mentioned. Try maintaining ambient conditions, reducing
load, reducing door openings.
Once temperature is stable, cycle dynamics should return to
normal range. If not call service.
Warm load (or) overload.
Frequent and prolonged
door openings.
Problem Cause Solution
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