Had the propane heater running today just to make sure all was running OK since I just got it back from the factory service center. Went to check on it a few hours later and I noticed it was off. Easily found out one take ran empty. Switched it over and would not start.I though maybe the transfer valve was having issues so I put another full tank on the empty side but still nothing. Have propane to stove but heater will turn the fan on but not ignite and shuts off in a about 30 seconds. Any ideas before I rip into it?

Steve

Try turning off and on a few times sometimes takes a few before it lites
I had the control module on a sob that went bad it is located to the left of the burner. I would tap it with the handle of a screwdriver and worked for a while before it needed replacement

I would think that you just ran the heater gas line out of gas and now you need to cycle the heater a few times for the line to purge. lesson to the genitor after it tries to lite @ the end of the cycle turn switch of for a minute or so and then try again. it has happen to me and I think it took 3 to 5 tries before lighting. Hope this will help you.