here a daft thought
try If you have another tx or rx you can use ? as you say the the ESC is powered as the fan is working
do you have steering working when you switch on ?
its almost as if the rx is not getting a signal from TX (via esc) hence orange lighton ESC
is the ESC to rx lead plugged into the ESC or is it hard wired from ESc (I have plugged them in wrong way round on ESC before (because red wire is centre pin 5v still goes to esc but the 2signl wire fron rx is wrong way round
no guarantees, it may help though
dave
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