There are really only a few things that can go wrong on an RV Absorption fridge.
Burner dirty/clogged. Routine burner cleaning (An insect loves to nest in gas lines)
Spark gap too wide (never seen it on a Fridge but several other devices)
Bad control board gas valve or propane supply
Bad electric heat element
Tripped thermal breaker (yes there is one look on the "Stack" (right side outside) for a small white button)
Failure of cooling unit
The breaker you push button
The Spark gap you reset per instruction manual
The burner oriface you clean
Blast some air (not too powerful) DOWN from the top to blow crud off the heat exchanger.
Propane supply you refill the tank or replace the regulator or both.
The rest you replace the module.
