Thetford fridge

It sounds as if the gas igniter is clicking, perhaps.🤷🏻‍♂️ That’s where I would start looking.

How do you know the fridge isn’t working on 12v? It will only be powered by 12v when your engine is running and the controls are set appropriately. 12v will not work as efficiently as 240v by any means.

Hi

It's definitely a electrical clicking/buzzing sort of sound. When I start the engine and  switch the controller to 12v the blue light on the fridge just flashes so I know it's not working 

Right. Perhaps it might be best to get a mobile technician to look at it as it’s near impossible to diagnose remotely. 

Incidentally, you’ve posted in the caravan section so I expect a mod will move your thread into Motorhomes or Parts & Accessories at some point.

Sounds similar to a problem we had not long ago. Igniting, but then going out. Ours was a sooted up burner, the carbon glowed, but it had burnt through the rubber on the thermo coupling. OH accessed fridge via exterior vent, cleaned things up, replaced, but ours was too far gone, so bought new thermo coupling and fitted this, and all now fine.

Fiddly, but doable, otherwise it’s a job for service engineer. Our fridge is only a very small under counter one, not a full size or floor to ceiling fridge/freezer, in a 2001 AS.

Good luck with it.

Edit, ours was definite a gas problem. It worked fine on hook up.