I have a heil forced air heating furnace that is going on and off and will not stay on to come up to temperature. It will not burn for more that a minute before it cuts off again. It was working fine just a week ago and now it is doing this. Would you have any idea of what may be wrong and what we can do to fix it.

Check and clean flame senser,, is fiter clean,,

Might need to replace high limit switch.