If wiring is correct to thermostat, why wont the blower come on after furnace ignites&draft inducer kicks in?

I recently posted a question concerning my thermostat wiring sequence & was helped by Jay who answered my question and got me running(thanks again) but now my blower will not come on after the draft inducer and pilot ignites. They both run for awhile and then the system shuts down completely. I have a CT51 series thermostat and the wiring is as folows: R=RED G=GREEN Y=BLUE W=WHITE. On the ct51, R and RC screws are bridged, should I leave them that way? I should also note that there is no RH screw, just R, RC, G, W, Y, B,O. This is driving me crazy, but I love diy and I am willing to keep trying. So can aybody help?