10
Thermo Scientific Revco Laboratory Refrigerators Installation and Operation
11 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
1. Check that the cord is securely plugged-in.
2. Plug another appliance into the outlet to see if it is live.
3. 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 7.1 on page 6.
Condenser Make sure the condenser is clean. Refer to Section 10.4 on page 9.
High pressure
Check the system high-pressure cut-out button. This is an encapsulated control with a rubber boot
over the reset button. To reset the control, push it down; use a blunt instrument to avoid tearing the
boot.
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
1. 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.
2. 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.
3. If the compressor is running and there is airflow behind the evaporator, contact an authorized
service provider or call the technical support hot line for assistance.
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