Is there a manual for the Firefly system, and does it have a "hard reboot" procedure similar to the Dometic Stat in the older models?
These search results probably don't apply to your system, so FWIW I guess.
There are various Firefly threads which might have the info:
This thread looks promising IMO:
. . . in particular this post:
[click on orange arrow to go there]
Originally Posted by SMKovalchik
Spoke with Airstream yesterday. The customer service representative I spoke to had just, a few minutes prior to that, talked with Firefly about that very issue.
For others checking this thread the solution is turn the battery switch to off and unplug the shore power or flip the main breaker. Let it sit for 2-3 minutes then flip the battery back on and plug the unit in. It resets the Firefly system and should rectify the problem. (In our case flipping the AC breaker took care of the problem so far.)