I was changing out an old mercury switch dial thermometer for my AC to a chromotherm IV T8600D2028. I wired it as instructed with Y to Y, G to G, and R to Rc with a jumper to R. They also give a resistor to wire between Y and W. With this configuration the thermostat activates the AC but then goes blank. Any thoughts?

Remove the resistor

remove the the resistor
Thanks for the reply but that didn't bring back the display. When I install without the resistor I can't get the display initially.