Troubleshooting Guide - Thermo Scientific TDE Series Manual

Troubleshooting Guide

This section is a guide to troubleshoot general operational problems.
Problem
Unit warming.
Not reaching set point.
Unit recovers slowly to set
point.
User interface (Display)
failure.
Thermo Fisher Scientific ULT Freezers
Cause
Warm load/Over load.
Hot environment.
Dirty condenser and
condenser filter.
Not enough space for air
circulation.
Icing/Frost due to high
relative humidity.
Excess frost build-up in
chamber.
Frost build-up on lid
gasket.
Gasket damage.
Prolonged lid openings.
Inadequate power supply.
Either of the compressors
are not working.
Breaker switch off.
Solution
Allow ample time to recover from loading warm product.
Do not overload cabinet. Refer Initial Loading in user
manual for loading procedures.
Check, if the location meets ambient requirements (within
15°C to 32°C or 59°F to 90°F) and away from hot objects.
Clean condenser and filter. Refer Cleaning the
Condenser and Cleaning the Condenser Filter in user
manual.
Install the unit in a level area free from vibration with a
minimum of 8" (20 cm) of space on the top and sides,
6" (15 cm) in back.
Check if the location meets requirements. Maximum
relative humidity 60% for temperatures within
15°C to 32°C (59°F to 90°F).
Defrost the unit. Refer Defrosting the Freezer in user
manual.
Wipe with a soft cloth or cryo-gloved hand. Do not use a
sharp tool. Be careful not to puncture the rubber gasket.
Check for punctures or tears on gasket. Replace if
necessary. Refer Gasket Maintenance in user manual.
Avoid opening of lid for a prolonged time. Allow ample
time for recovery after door opening.
Check for proper voltage to the unit.
Call service.
Check circuit breaker and reset to on position. Always
use a dedicated, properly grounded circuit.
Troubleshooting Guide | 21