Fan Control fails for Lian Li SL 140

Fan control fails consistently for Lian Li SL 140 Fans. The SL 120s work fine. Only 2 channels used on the SL controller. Latest firmware verified. Curernt Setup is : 3 x SL120 on channel 3 adn 2 x SL140 on channel 4. Also tried it on Channels 3 and 1 respectively. No difference. Any thoughts iout there?