Hi Arron, thanks for posting a reply, I'll give it another try but it does seem strange that the unit starts freezing the indoor coil in heat mode. My first thought was I've mixed up the wiring (the yellow and white wire are very similar in colour) so I tested but everything seems correct.

On the outside unit connections where there is an Allen Key underneath the capping nut how far do you have the Allen Keys unscrewed? My manual doesn't say much about this but a later vesion of the manual on the web says open both fully.

I think I'm going to have to call a Fridgie, I just hope I get a good one as my last couple of tradesmen haven't been the best.

Cheers Pedro )