Vintage Air question?

[6camaro9]

This winter I installed vintage air on my car. Its a gen IV system with there front runner system, it was very easy to install and so far I am very happy with it. I am also using a Ron Francis relay kit to control the fan via the temp and the ac. I am just having one problem with it and that is the ac will not kick the fan on when it is needed. Everything on the trinary switch seems to wire up correctly but I can not figure out why it will not kick the fan on. Talked to vintage air and they said that the head pressure had to be 254. I am going to talk to the man who charged my system but I pretty sure that it was over 254. Can anybody give me some ideas of what could be wrong and where to start checking. Thanks

Richard