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Troubleshooting
This section is a guide to troubleshoot general operational problems.
Symptom
Unit does Not Run
Runs Continuously
Noise problems
16 | Troubleshooting
Probable Cause
Unit Unplugged
Blown fuse or tripped circuit breaker.
Temperature control knob is turned to OFF.
Frost build up on refrigeration coils.
Dust or lint build-up on condenser.
Door gasket worn out.
Temperature too low.
Ambient temperature over 109ºF (43ºC)
Door opening frequency is high.
Contents of unit set too close and rattling
against each other.
Hissing or gurgling noise is caused by
refrigerating fluid circulating.
Unit is not level on floor.
Fan noise
Flammable Material Storage and Explosion Proof Laboratory Refrigerators and Freezers
Action
Plug in Unit
Check fuse or circuit breaker at breaker box.
Turn temperature control knob to ON.
Defrost unit
Clean the condenser with a dry brush or
vacuum.
A leak around the door gasket will allow cold air
to escape. This causes unit to work harder than
necessary to maintain cold temperatures.
Re-seat or replace the gasket if worn.
This may cause unit to run continuously. Check
optimum running temperature.
Is the ambient air over 109ºF (43ºC), or the units
located close to heat sources? If possible,
move to a different location.
An unusually high frequency of door openings
and closings can increase operating load. Unit
will stabilize as these are decreased.
Rearrange contents as needed.
This is normal
Check the level of unit.
Airflow can cause this. This is normal.
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