Ok, my understanding of the emergency start, is about all that does is connect the house batteries to the chassis battery(s). The next question I would have; when you can’t start it and there is zero solenoid sound (that click) can you, or have you ever been successful in getting it to start without using the emergency start feature? If your answer to that is, never, than I would suspect something is reacting or overreacting to what may be a slightly low voltage issue, possibly the computer blocks the start process, or possibly the solenoid itself may be failing. Any mechanic will tell you, their biggest challenges are usually electrical problems.
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