Labconco Protecto Series Evidence Drying Cabinets 3400004 - Manual (Page 37)

Chapter 7: Troubleshooting
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PROBLEM CAUSE CORRECTIVE ACTION
Filter System Light
turns on Blockage of the
intake prefilters Check the inlet prefilters; replace if
needed. Ensure that there is no
obstruction of the exhaust on top of the
cabinet.
HEPA filter loading Replace the HEPA filter.