on all mitsi/ daikin there is tape over contactor that say "don't push in" you must have torn this to push in.

I think that you may get back feed that can effect pcb etc. Also on some models pcb controls compressor rotation (i think) so you may damage it!!

It is alright to push in contactors to most other fridge stuff, but japanese ac units with pcb's are a no no!

I still think you may want to reset power to clear fault then put guages on if unit runs, get yourself a solenoid magnet to test the valve. Also if site (or unit ) has lost a neutral it will blow ZNR (blows at 550V) make sure this hasn't blown (it looks like a green leaf) -if it has check neutral and replace outdoor pcb