Sorry I forgot about that possibility. My original TS -140 had stock springs which require zero weight preload. My TT was near the limit so I had the heavy duty springs installed which require a minimum weight of 125lbs. When it was delivered I had the same error not realizing the preload requirement....I tested it w/o the TT on it and freaked out. Glad all will be well soon for you.
Update on TS140 I had on loan:
Unit is not defective. It apparently had different springs installed from stock that created a min weight (150lbs) requirement that we didn't know about. So thats were the error comes from.
When we added weight (a lot!) on top of the components it worked. Unit is being restore to stock at Herzan....