Hey guys,
just need some help on a Mitsubishi split unit im working on (MUH-A26WV).

When the units on cooling it pumps down into a vacuum, looks like there is a blockage in the liquid line, I was thinking the LEV (Linear Expansion Valve) or strainer.
BUT...

When I put a magnet on the reversing valve it heats ok. If there is a blockage in the liquid line then it wouldn't work on cooling and heating?

As soon as the unit turns off the suction pressure goes up to 20 bar quickly so it has plenty of refrigerant.

below is the schematic diagram for the system,looks like when its on cooling and heating it goes through the LEV, capillary and strainer. That's why im confused it works on heating but not cooling? let me know if anyone has had experience with this issue.

Thankyou

mitsubishi.JPG