The Problem.. Unit starts fine, burner lights off and runs for about 5 min. then goes out. It will restart sometimes, but stops lighting after 5 or six min. The ignitor will power up and glow trying to light the burner but gas valve will not open, i assume as no gas is flowing so the ignitor will time out and goes off. Once everything cools down the bruner will light and the cycle will start again.. Troubleshooting so far: Cleaned out all dust and lent, disconnected unit from the wall vent tube, same problem. I assume the Terminal switches and fuse's are good as it will light off at frist and will cycle the flame one or two times before it stops relighting altogeather. This appers to be a terminal problem. I'm replacing the ignitor as I broke the heat element blowing dust and lint out of the burner, but it's not the problem as it glows.

Thanks for any help in advance.. Nancy