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You have not really provided enough information to help you. To work on all modes as required the fridge needs to be properly installed, so connected direct to mains through the electric hook up on van, 12v supply via relay to van battery(not leisure battery)& to gas supply.
Usual reason why fridge won't work on mains is failure of 230v element, on gas, if burner is not lighting for some reason or on 12v, element failure again. If it won't work at all then suspect coolant leak & fridge is scrap in this case.
Does the installation look ok or is it a bodge? To sort it youself you do need some practical skills.