Quote Originally Posted by frank View Post
Unfortunately, I don't recognize the Australian model number so I can't really comment on a possible cause.

You have given a clue though.



No change in pressure means one of two things with the compressor running:

1) 3 phase unit running backwards
2) single phase comp not pumping

Now, as the unit is a small split, I would say it was single phase so number 1) doesn't apply.

Number 2) could be a result of:
a) internal bypass valve open
b) internal discharge line broken
c) lack of oil in the scroll (assuming it is a scroll)

Without the compressor operating correctly and creating circulation, I'm intrigued to know how the pressures seem ok?


What are the pressures? What gas is it on? Any history on the unit?

So many questions.
I'm a frigie by trade.The reason why I mensioned the gas was that the pressures in the system when off seemed to look ok in relation to a gas leak.Yes the compressor dos'nt look like it's pumping and that would mean that the temp on the indoor coil would not be rising thus not turning on the indoor fan.But why when just selecting the fan onlone will it not start.I'm not familiar with Fujitsu units as we don't install them on our jobs as I'm not a big fan.