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yes you should be able to take the hose off the switch and blow through it, it should be open from there to the tub bowl it mounts to. Does the machine fill with water?
have you checked the drain pump, the pump should come on after the door locks and if its not then then it will stop.
have you checked voltage to the water inlet valve when starting a cycle?
if you are getting voltage to the valve the valve is bad and needs replacing but if it checks out ok and you have replaced the ccu, the pressure switch, the hose is ok, all the wiring looks good, the drain pump is ok, then I would unplug the washer, unplug all the connections to the ccu plug them back in, plug the machine back in, go into diagnostics clear all the error codes, unplug the washer again for 5 minutes and restore power and see if it starts a cycle, if not I will be at a complete loss.