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USI CB-300 evaporator fan running/not running


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Hi everyone.  I was checking a deck out today before I put it back in the machine for a location and the evaporator fan is a little odd.  It barely moves at all at first but then it randomly kicks on full-blast before shutting off again.  I don't see any control board so I don't know what would cause it to go off or on.  Could I just have a bad evaporator fan?  This particular deck has two condenser fans in the back and one evaporator fan on top.  The compressor was running the entire time (I had it in a 70 degree environment).  Shouldn't it be on always?  I never noticed before.

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