Troubleshooting Guide - Thermo Scientific TSX Series Installation And Operation Manual

Troubleshooting Guide

This section is a guide to troubleshooting general operational problems.
Problem
Unit warming.
Unit set to –80°C but can't
make temperature (Not
reaching set point).
Unit recovers slowly to set
point.
User interface (Display)
failure.
Unit is ON but display is
showing empty.
38 | Troubleshooting Guide
Cause
Warm load / Overload.
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 outer
door gasket.
Gasket damage.
Prolonged door openings.
Inadequate power supply.
Either of the compressors
are not working.
Refrigerant is insufficient.
Breaker switch off.
User interface not
powered on.
User interface not
powered on.
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 inches (20 cm) of space on the top and sides,
6 inches (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.
Occasionally scrape the ice on the gasket.
Check for punctures or tears on gasket. Replace if necessary.
Refer Gasket Maintenance in user manual.
Avoid opening of door for longer duration. Allow ample time
for recovery after door opening.
Check for proper voltage to the unit.
Call service.
Call service.
Check circuit breaker and reset to on position. Always use a
dedicated, properly grounded circuit.
Push power button on user interface and hold for at least
1 second.
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.
Ultra Low Temperature Freezers