JoeSpareBedroom wrote:

you have to open the main propane valve very carefully or the
regulator will kick into some sort of safety or limiter mode
and the grill temperature will never get higher than 325f.

Please go to the Weber web site, locate the online (PDF format)
user's manual, and give us the link so we can read the
appropriate section. Then we can answer your question.

http://weber.com/help/manuals/pdf_fi...479_082208.pdf

I suspect the problem is in the regulator (the diaphram-shaped thing
that's part of the connection fitting that screws into the propane
tank).

There is no useful reference to the regulator in the manual, except in
the safety warning on page 2.

Here's a picture of what I'm talking about:

http://cdn.cloudfiles.mosso.com/c128...d27af49df4.jpg