OK, well, there are some simple things a carpenter can look for...
We still sort of need to know if there's any display on the refer? What brand and model is it? There's an 'Auto' switch on it, press that, and it should switch to LP for testing.
What happens when you switch it to LP?
Assuming that the flame tries to light, but goes out quickly...
Outside, under the vent cover for the refer, check for debris in and around the chimney area. Blow out with a 25 PSI compressor (or vacuum cleaner) gently. Tap the chimney to see if any rust falls out. Rust can block the flame. Note that there are spiders that love to build nests right on the gas flame assembly.
Check for loose hardware in and near the flame area. Everything there should be tight. The two stiff wires that hang inside the flame area should be there inside where the flames should be. Make sure the assembly that holds that device is tight and those two stiff wires haven't shifted any.
Let us know.