Going to "check" while on propane

[Ridnridges]

2018FR A-frame HW with almost 150 nights out camping. On most recent trip to Utah, fridge acted fine for first 4 days then developed sporadic out ages with control panel lights going from "auto/gas" to "check". No wind to speak of & fridge has performed great for the last 2 years. Many miles driving gravel / sand roads in the Swell on the way to Moab. Pres " off" button, let sit a minute, hit "on" and normal panel lights come on. 5 minutes max check light reappears. Put new propane bottle on line & problem solved.... For two days, then problem redeveloped. Sometimes run for 8 hrs,other times 2 hrs. Last 24 hrs on drive home & no cooling function. Phase two: once home & hooked to shore power, started fridge & ran 25 hrs... Temp down to 28° .. All is working! Detach shore power & return to "auto/gas" setting and begin monitoring. ( also cleaned inside access panel & wiggled wires/etc. ) within 2 hrs problem returns! I' m guessing bad sensor or relay/ ?? Hoping an expert out there can help steer me to solution. Thanks in advance!

[NavyLCDR]

What is your battery voltage?

[Ridnridges]

Voltage in normal range, Didn't drop below 82% while camping. Full solar hookup to Renogy suitcase while camping.
Once at home battery level restored to 100% before beginning test of fridge.

[KyDan]

I wonder about your propane supply.
Does your stove appear to have normal size burner flame?
Does your water heater light and burn vigorously?
If these appear normal it's time for a tech to check the fridge for proper flame.
That's all I've got....
Good luck!

[Ridnridges]

If "check" light appears, first thing I do is check burners for flame. Do not use eater heater ever. Burners normal. Will re run my "experiment" today .... Post results later.

[Trawlerphil]

If the furnace runs properly it probably isn't the propane regulator, but if its wonky, I'd replace the regulator. They fail pretty regularly so having a spare is a good move if you want hot food with your meals.

[Ridnridges]

No problems with propane system, only 3way fridge when left on the "auto/gas" setting. Works fine on shore power... Turned it on at 9 am this morning and at 5 pm now 35°in fridge. About to go and switch setting from AC to auto/gas and will monitor it in an hour to see if defaults to "check" stay tuned, more clues to come?

[Gizmosmom]

We’re you at a place where the altitude was over 6,000 feet?

[Ridnridges]

We were camping near Moab & uncertain of elevation. Fridge has operated fine at elevations up to 10,000' while in Colorado. Does not seem to be elevation related; had a fresh 20 lb tank .