Coleman Intertherm Nordyne Miller Furnace Control Board 904531 "pressure stack diagram" Questions

...diagram... but I fixed it by wiggling the pressure switch and it "clicked". How do I keep this from happening again? If you can help I can email Pix and a more detailed description. Thanks Dan Thanks ...

...stack checked for any obstructions, so air can flow through and out properly. Also have gas pressure checked and burner cleaned. Sounds like a problem with the temperature sensor. If it's covered in ...