Thermo Scientific Revco RDE Series Installation And Operation Manual page 22

Problem
Unit tripping the circuit
breaker.
Excessive frost build-up
around perimeter of door.
Unit is over cooling.
Unit compressors run
continuously.
Cabinet temperature reached
an alarm
condition, but suitable alarm
is not activated.
18 | Troubleshooting Guide
Cause
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
door openings.
Gasket damage.
Set points may have
changed.
Temperature offset may
have changed.
Unknown.
Freezer set point is low.
Frost build up.
Dirty condenser.
Gasket damage.
Alarm setpoints may be
changed.
Solution
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 outer door.
Be careful not to puncture the rubber gasket.
Avoid opening door 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.
Check whether the setpoint is in operating range. Change
the setpoint if necessary.
Defrost the unit. Refer Defrosting the Freezer in user
manual.
Clean the condenser and condenser filter.
Check for punctures or tears on gasket. If replacement is
necessary, call service. Refer Gasket Maintenance in
user manual.
Check the present setpoints for temperature alarm
conditions. Change the setpoints if required.
Thermo Fisher Scientific ULT Freezers