My bryant gas furnace blinks 3 times with an orange light. When I turn the furnace on it clicks and a fan comes on for 90 seconds then shuts off. What is this things problem its 6 yrs old

If you can give the model # of the furnace it will help. From what your saying it sounds like a pressure switch is stuck closed or open. The code to the flashing light should be on the blower door.