Do you hear the spark thing trying to light? It'll sound like "click, click, click" until it turns off if it does not light within about 30 seconds and then the "check" light should come on, on the fridge panel.
Do you smell gas in the outside refer vent area when it does this and does not light?
Is the gas tube plugged where it enters the flame area?
Good luck! Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.