Jeff,

Just twist and pull off the burner cap.  The rest will be apparent.  Be
careful not to lose the small metal key.  Blow some compressed air
through the intake opening next to the burner dial on front panel.
Clean everything and reassemble.  If the fridge works fine on propane
you should be good to go.  Otherwise you might need to test the
pressure at your regulator...
Archive search of Refrigerator Madness  or U tube manometer should
provide further info.

Paul
'89 Westfalia