take the outside fridge vent off-- look for yellow powder- which would be from the ammonia sulfur leaking. Hope and pray you don't find any-- this is the death of the fridge-- new fridge is over $1000; refurbishing the cooling system will cost $800.
Could be electronic (lets hope)
1. When running on electric there is a heating element which heats the sulfur ammonia. If heating element is broke then fridge won't cool
2. The temp gauge which sends signal to heat up the ammonia to cool is called a 'mister' this is usually located near the fins in the fridge- if this breaks then and doesn't send the signal to cool then...warm fridge
3. Igniter is electronic solenoid which lights the pilot-- but first try cleaning the pilot of cobwebs and ensure gas is getting to it. You can try to manually light the pilot.
RV fridges work better on gas than electric
4. Could be the circuit board- but if check light is on then circuit appears to be working.
