Troubleshooting Guide - Thermo Scientific Revco RDE Series Installation And Operation Manual

Troubleshooting Guide

This section is a guide to troubleshoot 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.
Power failure to the unit.
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 outer
door gasket.
Gasket damage.
Prolonged door openings.
Inadequate power supply.
Either of the compressors
are not working.
Breaker switch off.
Power supply stopped /
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.
Occasionally scrape the ice on the gasket. 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 door 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.
Confirm that the cord is securely plugged in.
Plug another appliance into the outlet to see if power is
present.
Always use a dedicated, properly grounded circuit.
Troubleshooting Guide | 17