Great game - well done on the content so far.
Unless I'm missing something - after you warm up and have a cup of tea in Kian's room - there potentially is an issue with the trigger with the remote.
Basically trying to open the remote after you sort out the initial conditions before the briefcase and during the setup of the briefcase contents comes up with 'You won't even try it first' msg - the corresponding object linked to the remote doesn't allow you to swap around as you could before warming up and having the cup of tea.
Using the lightswitch even mentions what needs to be done.
So conditions are:
1.) Enter room.
2.) Sort out heating and tea - message about briefcase.
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At this point the remote can't be interacted with.