Go to the website for the maker of your fridge they will have a check list and what to do for troubleshooting. Or look in one of the drawers in your MH that is where most put the manuals for each of your appliances.
Look on the fins inside your fridge there is a metal clip on one of them THAT is your thermostat move up or down depending on what temp you want.
There is an ignitor on your hot water heater. If you don't hear any clicking when you turn it on, it is not igniting the gas.
Good luck, don't give up and don't go out and buy a new fridge. All these things can be trouble shot and fixed and/or repaired yourself for very little investment. :C
We must be willing to get rid of the life we've planned,
so as to have the life that is waiting for us.