sounds as if your gas jet needs cleaning and at the same time ensure the exhaust outlet pipe is clear
best toremove the fridge and connect upto agas bottle tosee what the flame looks like it should have No yellow and should look like a dark blue centre flame with a lighter blue outer
The jet can be removed if you are careful and blown out DoNot probe it with wire if you have to resolve to this use copper or Brass wire
Hope this helps Roger
Roger L
February 2008