Atwood water heater - pilot light and flame malfunction

Check your propane tanks (are they full?), make sure the valve is on, then check to make sure gas is making its way to the hot water tank, if the pilot lights but won't stay lit your flame sensor is faulty.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mike_a0891ab86974ea74

Do you have manual for proper lighting procedure? Do top burners have good flame?

If pilot lights and flame is robust and clear blue, and pilot goes out later, then some suspects can be excluded: air in gas line, low gas pressure, thermocouple is overtightened (finger-tight + 1/4 turn), thermocouple not positioned correctly in the flame, dirty pilot tube.
If flame is yellowish and small: then clean pilot tube and combustion parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Clean the burner and burner tubes.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

Read your manual for maintenance and troubleshoot steps

Did you make sure the connection between the thermocouple and the control is tight and that the tip of the thermocouple is in the flame?

Try removing the thermocouple where it attaches to gas control, and spray a little WD-40 in the hole, then spin a rolled up small piece of steel wool in the hole as well, then blow it out with compressed air if you can. Then reconnect thermocouple. Make sure thermocouple tip is getting good flame under it, and if that doesn't cure it, then it's time to replace gas control.

So are you saying that the first initial lighting of the pilot, without turning to on, works o.k., good flame etc, ? If not sure, try lighting pilot only, and leave setting at pilot only, and see if it's a good flame, and get back to me.

Sounds like the burner flame may be too strong (jumping out from burner tube) . Some people think the louder the better, but that is not correct. When burner shuts down like that, it has a tendency to snuff out pilot as well. Adjust your air shutter at burner so that the flame is a nice blue, or with just a hint of orange/yellow at the tip. Whatever setting that keeps the flame solid from burner tube, and not a big gap between tube and flame. Signs of soot (black) up the cover, or side of trailer means it's running too rich, and you've gone too far thus needs more air. Keeping the flame blue but still right out of the burner, actually heats better, is quieter, and should eliminate that pilot getting snuffed out. Pilot should also be a nice blue flame as well. There may be a problem with positioning of the burner tube as well, but doubtful if it has been running well in that position before. Let me know what happens.

It may very well the thermocoupler that is fault. It is that bulb that sits in the pilot flame. when it goes bad or doesn't sense a pilot flame it shuts all gas off. It needs to be replaced. Inexpensive do it yourself fix. Good Luck _Ned_

MAKE SURE THE BURNER TUBE AND ORIFICES ARE CLEAN. MAKE SURE YOU HAVE THE PROPER LP PRESSURE.