Lets just say, i change the oil in my lawnmower twice a year. I take care of everything i owe.
I flush the WH every single year and the vent is clear. Checked again yesterday. Mentioned before, i replaced the flame sensor, had the burner out/ vacuumed and cleaned everything. Pressure sensor is ok ( got a power vent WH). This thing has me beat.....since i can only expect 9 years from it, i'll just replace it and be done with it for another 9 years, or so i hope...
No snow buildup and checked the regulators, both on the propane tank and at the house. Vent Screens are clear.

Didnt sound like it, when i called him this morning and told him, i had only high speed.....
I'll post what the problem is, after it's fixed. It may help somebody else down the line...
Thanks for the help and tips guys. Much appreciated!

 

For the future, anode should be replaced about every 5 years to keep corrosion at a minimum.

 

Didnt know that. There wasnt much sediment at all when i flushed it out this fall. With a bad Anode, lack of hot water would be the problem, right? Mine shuts down, soon after getting started. As if there was a vent restriction....which there isnt

 

Too much sediment would be a lack of hot water. Anode gone would mean corrosion would start eating the inside of the take. That would end up with a tank that leaks or blows out.

I had mentioned the possibility of the flue being clogged or restricted because years ago during a snow storm my furnace shut down due the the snow on my roof being over the height of my flue. This shut down the furnace and it would only relight for a short time until I cleared the flue area on my roof. The same symptoms as your WH.