I have '95 Payne Model GB1AAV04811. Has been tempermental for few weeks...fails to ignite after inducer runs for several seconds. Eventually it would make it though. Today, it "Won't get over the hump". The LED is falshing 3-1 "pressure switch did not close or reopen". I have eliminated most other causes such as blockage etc. Can't check inducer motor with the fancy device I have heard mentioned. I am wondering if it is worth it to buy the pressure switch I found at furnace parts.com for $88. If that fixes it, of course I am happy. If not, did I waste my money? Any thoughts?