Williams Direct Vent Model 2203612, Pilot light will stay lite but when I turn the thermostat up it will lite then go out then lite and got out over and over. I check my LP Tank and it is at 30%.

SOURCE: pilot light goes out when turning on the thermostat

Check your thermocoupling to make sure that it is sensing flame. You can tell if it is good or bad by the white on the tip of the flame sensor. The other problem would be a blocked or closed flue pipe. Make sure that the cap is not smashed down on the pipe on your roof

SOURCE: I have a direct vent wall heater that I switched

If you can jump out the thermostat connections on the gas valve and the heater still does not turn on, check to make sure the thermopile is well into the pilot and getting hot. If it is, replace it. That is the safety for the main burner.It will have two wires wrapped with metal and note which terminals it is connected to on the gas valve.

SOURCE: i have an older model williams furnace co -

Check out the Grainger catalog, they will have everything that is obsolite but you might have to pay more.

SOURCE: The pilot light will not stay lit, I was told

Hi, this heater doesn't have a thermocouple, it uses a pilot generator which is more reliable so I doubt you need to change it out. First thing to check is that you have a clean "sharp" blue pilot, you should be able to hear it quietly roar. If it is yellow and appears "soft", the pilot need to be cleaned. The easiest way is to use a straw or tubing of some sort to blow into the pilot, gently tapping the pilot assembly. That should clean it up and heat the pilot generator properly. Tighten the the screw terminals at the control valve to assure good electrical connections and last but not least turn off the thermostat until you get a standing pilot. Good luck and stay warm.

SOURCE: have a vent free lp wall mounted heater.40 lp tank

Too much gas pressure. Are you sure that this is a LP heater and not a Natural gas heater? Is the regulator you have rated under 1/2 pound pressure? Try to throttle down the shutoff on the tank to see if pilot gets better. If so, you have a pressure issue. Gas you adjust the pilot gas valve?