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The fridge in my M reg Hymer 544 works on mains hook up and on 12 volt but not on gas.  I don't know what fridge it is because it has a "Hymer" label on the front. 

To oporate it on gas I turn the gas on, switch the vehicle electrics on, switch the red rocker switch on that then starts flashing until I press the knob that is supposed to ignite the gas holding it down for ten seconds.  When I let it go the red rocked switch has stopped flashing which should mean that the fridge gas flame has ignited.  The only problem is that I can not see a gas flame hole in the back of the fridge which has been in every other motor caravan fridge that I have had.

There is a black rocker switch with a fan sign over it which I would like to know the purpose of if any knows but my main question is:  What's the problem and how do I fix it?