Fujitsu Split Unt Wallmount Inverter 2.5HP

[Tayters]

If the unit was powered off and on from the main isolator before the testing this would have cleared the fault code assuming worse case it was intermittant and had just stayed out on the fault code.
If it faulted straight away when power was turned back on (I guess it was as in the first post you say the PCB was replaced) but only fired into life once the fan motor was disconnected then it's a fair chance that is where your fault lies.

If you fancy testing the fan motor then there a couple of tests you can do from this thread: http://www.refrigeration-engineer.com/forums/showthread.php?15069-Fujitsu-General-Fault&highlight=posistor post 59. Credit goes to Ozairman

Also if you search 'posistor' you will find some info on them on this site which might explain further the PCB operation. Took me a while to digest it all but makes sense and is easier to troubleshoot than you might imagine.

Cheers,
Andy (still a Rookie myself!)