There is a small pipe that goes from the thermostat housing to the expansion tank, this blocks and causes an airlock. Remove this pipe and check it’s clear.
Common issue with these. The load sensing line needs plumbing into the load sensing pipes on the rh side of the spool block using a special t piece with a ball bearing inside it. I can’t remember proper name for it. Your local dealer should be able to sort you out with the bits needed.
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