Checked and found error 3 fan failure. Found 6 flashing on VFD. Over current detected. Switch VFD with top unit. Issue went away. Customer would like new VFD ordered over night. Item was in stock, no QWP (expedited freight) charge 12-23-2016 Removed old VFD. Installed new. Tested. OK for use. *Left bad part behind for customer. They may try and repair for themselves.