Hi Kboeste, the ground or ground pass, you should check it separately, if you remove the 5 wires you stop feeding the outdoor unit and so you can know if the grounding comes from the indoor unit, but not if it happens in the outdoor unit , which is usually where it comes from. Check out. The solenoid valve measures it by continuity, as I will explain later with the compressor, the capacitors are also grounded put some insulating material that separates it from the equipment, plastic or rubber, check the cables to the compressor especially in its terminals, measure continuity ground or ground with a multimeter on the lowest ohm scale, disconnecting the cables by measuring directly to the compressor terminal without an electrical current connection, one by one, all terminals, against the housing or against the pipes where there is no rust or paint, only with the multimeter and also the same thing to the fan but from the cables to the body or housing of the fan, measure all, the terminals and the cables have to offer some reading to each other, but never to earth or mass. Another thing that catches my attention is the low pressure of 40 pounds / psi, it must be above 60 psi, otherwise the equipment is failing refrigerant, unless there is a lot of environmental cold in your country. S @ lu2 friovega63.