Dometic fridge

I am going thru my pre-check list to make sure that everything is in working order before heading to Texas tomorrow AM. So I decided to disconnect the Dometic fridge from the Electric source to make sure it would switch over to propene. ( yes I have it on auto ) I hear the electric click then it stops after a few seconds. The question is, Am I suppose to hear the flames turn on like when the hot water tank comes on, or the heater? I can not remember if it did this last time I used the T.T.:h

Thank you all in advance...