Hi rexnar,
Sorry to year you're having a problem with the fridge. Hopefully it's something simple. I assume you're plugged into shore power.
Let me also assume that "did not work" means no cooling, no lights when opening the door, nothing showing on the control panel, if it has one. Also assume that the fridge is turned ON (dealer might have turned it OFF).
First thing to check would be the 110V circuit breaker panel. Flip the refrigerator circuit breaker OFF then ON in case it tripped. Sometimes when the breakers trip, they look ok because they move only slightly.
If that doesn't help, turn off the circuit breaker for the fridge and try to get it running on battery power. There's probably a remote button for the refrigerator's power inverter (that converts 12V DC from the battery into 110V AC). It probably looks like this.
By starting the inverter, with the 110V circuit breaker OFF, the fridge should start running on battery power. If it doesn't, go into the front storage compartment under the pinbox and press the reset button on the GFCI outlet on the Inverter.
There should be an outlet on the inverter, with a cord running to a transfer switch. Where the cord plugs into the outlet, there should be a TEST button and a RESET button. Press the RESET button.
If the fridge still doesn't run on battery, and doesn't run on 110V shore power (with circuit breaker ON), you may have a problem with the transfer switch. It's also possible, but unlikely, that the fridge has come unplugged at the outlet it plugs into, which you may not easily get to.
You can scope this all out in more detail by taking a look at our owner-written
Residential Refrigerator Guide.