thanks for the response…. sometimes the blower starts and then shuts off after 3 seconds. sometimes the blower starts and the igniter lights, but when it goes to open the gas line it turns off. If I start blower with tubing disconnected (not sensing pressure switch)it runs continually but it is looking for something to tell it to light the igniter, which since the pressure switch is not connected it never tries to light, and then after 30 seconds since it did not see a flame it shuts down.
I don’t know what to do at this point.