We recently replaced our control panel in our Carrier unit - HH84AA020. Went to turn the A/C on tonight for the first time since being replaced and it didn't come on. After doing some research, I determined (hopefully correctly) that the tech needed to cut the R17 resistor since the panel is using an R-Y call. So I cut it, and voila, she worked. However, I randomnly decided to test the fan mode operation, and it won't come on. Any ideas?