My funace will shut off after 90 seconds and not turn back on even when the tempture is set higher and it has not reached the set temp, what can I do or what do I need to do to fix this problem?

If you have a mechanical thermostat, it may be the heat anticpator, if you remove the front of the thermostat you will see a small arrow pointing to some numbers, move the arrow to a higher number such as .45. Good luck, Mike