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Just to clarify this...........it is a Dometic model RM2555 fridge? And when was the last time you had the LP pressure checked at the tank regulator? That needs to be done at least once a year. When you try to ignite this on gas.........does it try to ignite or not? Can you hear the igniter clicking? You may have to open up the outside inspection cover on the rear of the fridge to hear that. Let me know about these things and I can assist you in sorting this out. I am enclosing a link to the manual for this model if you don't have one. All follow ups are included in our fee.
You will need a manometer that reads in Water Column Inches. From your last post it sounds like it may be a burner or control board issue. Even if the gas pressure is too low, it will continue to try to light. BUT, take a look at the gas valve area and see if the screw for the on/off is horizontal which would be "on" here. And the burner may have some bug debris in there that is keeping it from igniting. They are attracted to the ethyl mercaptan in the LP.
Then the control board is probably the culprit IF the gas valve ohms out o.k. That should be about 45 to 55 ohms. See what you have and let me know.
You can check this by checking for 12 VDC at the plug for the gas valve........if you have a small digital multimeter.
That blue wire doesn't go anywhere. Was the fridge in ignition mode when you too the voltage reading at the plug for the valve? IF not, you need to see what it is then. It doesn't seem like the board is putting out any DC voltage to the valve.
That pretty much narrows it down to the control board.............and I would get one made by Dinosaur Electronics as they are far superior to the OEM boards. They come with good instructions and have a 3 year warranty should you ever need it.
I guess they don't actually make a 240 VAC version yet...........so, you would need to stick to the OEM part for now. I will give them a call today and find out if they will soon and let you know.