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No "turn off valve"........you just shut the water off at the source OR turn the pump off. This is probably some debris in the inlet of the faucet or fixture IF you have cold water coming out. That may take removing the fixture to get to the intake screens. The only other cause MIGHT be if someone put a valve in the hot line into the bathroom and it is closed. That wouldn't be a factory OEM thing I don't think. Get me the actual model number of your coach and I can probably dig out some plumbing diagrams for you. IF this is a brand new rig, it will be covered under warranty and you might not want to do much yourself as that can void some aspects of the warranty in some cases. All follow ups here are included in our fee.
They only have them listed through 2015. You might want to give a mobile tech a call and have him take a look and see if that hot line (red) has a valve someone may have turned off.
You are welcome! Please let me know what it turns out to be. Nothing like that on older models.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?