Home Improvement → Re: URGENT Furnace stoped working!

Thanks, are you going off of what I said about the red light flashes your self or my guess?

also, if it is that can i do it my self? How come it started to work after I power cycled it? Thanks

Your code is a 21, indicated by the flashes. This indicates a problem that is more in depth than most DIYers should tackle. It needs to be determined if the valve or the control board is faulty. You can check and ensure all the wiring is connected and not chaffed anywhere, between the valve and the board.