My furnace blinks 3 times repeatedly, it goes into what my furnace describes as "Ignition Lock" then it will restart after 3 hours, what does this mean and how can i change it? The house gets quite cold when it is in lock, and its to cold outside to have this happen.

Please try to keep all of your questions on the same thread, it is much easier for us to keep track of them. Most frequent cause for a lockout on your furnace is overheating, poor airflow, dirty filter or evaporator coil.