Brand new here, thanks in advance for any and all help, I'm honestly at wits end here I've exhausted my knowledge and i still cant get the issue resolved. Completely brand new system. Trane 4twr6 3-Ton 16 seer Heat Pump TUH1B080 XR-95 80K Gas Furnace. matched coil. JCI T9100 stat. Kele 10k ohm OA Temp sensor 18/8 wire with home runs from stat to CU, Stat to Furn,( it was easier to do it this way than through the furnace because of the length between the 3 devices so I made up the connections in the wall box behind the stat rather than in the furnace) Everything runs fine in cooling and in heat pump mode. When I set the lock out temp on the stat and it reaches the lock out temp outside, the stat wont fire the gas furnace or the HP. I can manually make it use only gas by enabling the Emergency heat. Then it will run only gas heat in a traditional manor, but the reason I went this route is to not have to do that. I tried to avoid using the trane comfort controller but I'm starting to think that may be my only option. I just have a hard time believing that the dual fuel stat cant do this on its own. Attached are the wiring diagrams i drew up. original and Rev 1. Initially what I thought was the problem was the black on the HP was somehow confusing the stat and when it called for aux heat it was hitting the HP instead of the Gas. SO I reconfigured the CU and the connections at the stat to combine the signal from the reversing valve and the HP Black and landed the furnace call on W2 but that didn't work either. I've got a pretty good working knowledge but I've reached my limit and need some help to figure this out.

Furnace is exhibiting strange behavior and I can't figure out what part has failed. System is set to "Heat", fan set to "Auto", and temperature set to 74. Room temperature drops to 70 and furnace will not start. I move the fan switch to "On". a moment later, the fan starts running and I set the switch back to "Auto". The fan continues to run, and, the furnace heats the house up to the set temperature. Then everything shuts off and will not start again, no matter how cold it gets, until I move the fan switch back to "On". OR I move the fan switch to "On" and leave it there. The fan motor runs continuously but the furnace cycles on and off, maintaining the set temperature in the house, even if I run it this way for 8 hours. Maybe it's the blower motor temp switch but I don't understand this behavior. Thoughts as to what is happening are appreciated. TIA