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You could have a dirty pilot burner orifice if you're getting a good spark. Are you comfortable removing the burner and cleaning the orifice?
Well, simple is a relative term. You have to remove the access panel to the burner chamber, disconnect the gas tubing to the main burner and the pilot at the gas valve then pull out the burner assembly. I can't find any specs on your unit so I don't know if it has a TRD which could complicate removing the burner. So I wouldn't say it's simple for a novice. A coupe other things you could try. First check the reset button on the outside of the inner access panel to the chamber. It has 2 wires attached and small button between the wires. Push that button. If it clicks you have reset it. If it doesn't click it wasn't tripped. You could also try lighting this with a match or a grill lighter (I know it says not to). If the pilot lights then the piezo igniter might be faulty, not giving you a good spark.
You'll need to remove the access panel to light this with a match
The thermocouple only comes into play once the pilot is lit. If you can't even light the pilot then it's not a thermocouple problem.
If you can't light it that's not a thermo problem. Maybe, it going out could be.
Some new pilot assemblies have a thermal cut out device in the assembly (not the button I mentioned earlier). If this trips you have to replace the entire assembly.
So if that's the case then both problems, pilot going out and not relighting, could be due to this issue
All I can do from here is give you the possibilities. You have to do some hands on troubleshooting to determine which is the culprit. What you can do without too much complexity is try lighting the pilot with a match.
I gave you a pretty simple option, try lighting the pilot with a match. Your success there or lack of it will narrow down the possibilities.
Until pretty recently lighting a pilot with a match was the only way to light a pilot. The only reason you don't now is because of industry paranoia about extremely rare fires caused by water heaters igniting flammable vapors in the room. Changing parts if not done properly is far more dangerous than doing what we've done for decades, lighting a pilot with a match. You need to contact customer service if you ave any billing questions.
Just the same.