You need at least 24hrs of cooling time without opening the refr.
There's too little information to know what's going on. Norcold, Dometic? Model?
You need good 12V power for the circuit board, then good LP pressure to run the LP flame with a good gas valve and thermocouple. For 120V you need power at the outlet, and the relay on the control board working, and a good heating element.
That's barely scratching the surface.
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