Quote Originally Posted by rxv88u View Post
are the 2 units with the same model no. giving you the problem? try pumping down all the units. with no pressure in the head units and guages on 2 separate suction ports, open each liquid line individually. see if there isnt a crossing over of pipes eg. liq line from system 1 crossed with liq line system 2. or you could just pump the unit down, remove all the pipes and run nitro through individual head units to make sure each set of pipes is going where they are supposed to.
you would think someone would have picked it up earlier but i'd give it a go..
as for the lgmv (lg computer analyser) i wouldnt bother. pipe thermisters should be 5-10k at about 20c.
if the indoor fans come on as soon as you turn the unit on from a cold start on heat, then the indoor pipe thermisters are ****ged.

All this has been checked... all pipework is connected fine

We will see what LG say when they visit.