My 8 year old Intertherm forced air furnace won't fire. Igniter is good red led is blinking twice says it's a pressure switch is open. Anything I can do myself?

Try tapping on the pressure switch while observing the status light. If operation is restored, pressure switch may be failing.

Nice it fired.Gonna let it run get some heat in here then I will see if it will fire again

Nice it fired.Gonna let it run get some heat in here then I will see if it will fire again