As this forum is world wide this is relevent to U.K only.
Have you checked the fuse in the plug or in the fused spur /doubl pole switch.?
2.Is the green light showing when switched to on?
The book says turn off gas or 12v as appropriate then turn the temp control to highest setting. Turn on fridge main switch which should glow green.
if it does then it could be the mains heat element so it's a job for a fridge engineer.
If you have no manual enter in google search box
Electrolux RM4270 leasure fridge and Look down list that comes up you should find Swift-owners-club.com click on that one and it will take you in to the fridges pdf of the manual then save it to disc.
Bob, October 2009