Originally Posted by BrettS

I pulled the top off of the monovalve and found that the plunger (if that's what it is called) was rather difficult to move. I replaced it with the one from a 420SEL I have sitting here (waiting for a replacement engine to come along) and the heat is working great now. I did lose an electrical connection piece though. The plug came apart when I was taking it off. I found the top black piece of plastic, but the bottom one is gone forever. So right now I have the wires on the posts without the plastic bits around them. I don't know how much trouble that's going to cause me. But right now I have heat.

Thanks for the help.

-Brett