Well I finally figured out what my problem is,me.........the only way you get reverse flow is to use Alternating Gyre Mode, in which case the indicater light will lite when the flow is in the reverse.........you can not select reverse flow like constant speed mode, otherwise you would have 5 modes.....thats what happens when you listen your LFS........Please excuse me for any problem I may have caused you...........I really must paid more attention to the videos as they never explained how to access the reverse flow mode, Why? because there is none !!
Sorry Ted