Firstly Not my field - Which function is/isn't working Gas, 12volt or 240volt? Or all three not working? What was the nature of work being done that created short circuit? Have you checked In-line fuse from main supply? Are there any other fuses in the Refrigerator circuit? What is the brand size and model No of Refrigerator?
Knowing all this may be assistance of a Keyboard warrior fridge guru.
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Possum; AKA:- Ali El-Aziz Mohamed Gundawiathan
Sent from my imperial66 typewriter using carrier pigeon, message sticks and smoke signals.
It looks simple enough with no electronics but no fuses there, so perhaps a wire has burnout or something simple. You will need to get a person who can check it out with a meter I think.
Hi
The very first thing to have checked was ,is the boiler getting HOT on both 240V operation, & 12v with the car engine running!
Now It is out, at least plug the 240V in & see if the boiler is getting hot
If it is, the problem is in the refrigerant system
First step is with power disconnected ,tip the fridge upside down
Give it a few shakes & let it stand overnight, then turn it upright & try powered on 240V again
Without knowing what was actually shorted, there is no way of knowing if fridge 12V &240V operation could be affected[It is a simple manually selected power source fridge [.no electronics]