Troubleshooting
Thermo Fisher Scientific
Laboratory Freezers
23
13 Troubleshooting
WARNING
: Troubleshooting procedures involve working with high
voltages which can cause injury or death. Troubleshooting should only be
performed by trained personnel.
This section is a guide to troubleshooting equipment problems.
Table -6.
Troubleshooting Procedures
Problem
Cause
Solution
Unit does not
operate or
Power Failure
Indicator is on.
Power supply
Check that the cord is securely plugged in.
All models except undercounter models have a double pole circuit breaker
located next to the power inlet. Make sure that it is in the ON (“1”)
position. Try cycling the switch to OFF (“0”) then ON (“1”).
Plug another appliance into the outlet to see if it is live.
If the outlet is dead, check the circuit breaker or fuses.
Temperature
fluctuates.
Cold control
Make sure that the cold control is set correctly. Refer to Section 6.
Condenser
Make sure the condenser is clean. Refer to Section 12.2 on page 22.
Unit warms up.
Door is open.
Make sure the door is completely closed.
Warm product
recently loaded
in unit.
Allow ample time to recover from loading warm product.
Power supply
Check for proper voltage to the unit. If there is no voltage to the unit, call
an electrician.
Compressor
If the compressor is not running, check if the unit has a power failure
alarm. If the power failure alarm light is on, have an electrician check for
proper voltage to the unit.
If the compressor is running, open the door and look through the slotted
air intake in the bottom of the evaporator cover to see if icing is present
on the evaporator. If icing is present and there is no air flow behind
evaporator, call technical service for assistance. The evaporator fans may
be inoperative.
If the compressor is running and there is air flow behind the evaporator,
contact an authorized service provider or call the technical support hot
line for assistance.
