I have a 2010 Aerolite travel trailer. Recently when hooked up to a water spigot I get water from the hot water side but not the cold water side. No leaks are evident, and water works fine hot an cold everywhere else.
When the trailer is not hooked to a water supply and the internal is used with the water pump, I get water from both the hot and cold sink valves.
The sink has a seperate hot and cold water faucet.