X2 on the plug and breaker.
As to the problem with the propane, you can get an "airlock" in the line. If this happens, you have to go through the reset procedure.
This is the procedure for a Norcold; Turn off the fridge, remove the 12v fuse, open the outside access panel, flip the rocker switch, leave it off for about 5 seconds, turn it back on, replace fuse, turn the fridge back on.
You may have to go through the reset procedure 2 or 3 tomes before it will fire up.
If this all fails then I would suspect the control board and if you are still under warranty, your dealer should be working to get you a new fridge.
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