Pick up some ODOBAN at a big box store. Follow instructions and air out good after cleaning. If you had never used the fridge ( in recent past ) on gas, the line was most likely not purged. The first time you use the fridge on gas ( and after each tank change) you should purge the lines by running the stove for a few minutes, then run fridge on gas. The very first time it may take a few tries as the controller is designed to try a few times to light then go into fail safe mode. You need to turn off ( to reset) then try again.
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