Repair vortex air conditioner

You are the trustee of whirlpool air conditioning, right? Please be professional when you talk big. Is it possible that the copper pipe is connected by mistake? The thickness of the copper tube at the high-voltage end and the low-voltage end is different, and anyone with a little common sense in air conditioning knows it! The biggest possibility of only "heating" at first is that the installer forgot to open the high and low pressure valves, and after maintenance, he fabricated a joke about the wrong connection of copper pipes to cover up the fault.