Comfortmaker modelGUH075A012IN Serial R894600119 It kicks on and runs, but never hear it ignite and blower not kicking on. When I kicked on manually it only blew cold air. Don't know what to try to check. Red light blinking.

Open the door where you see that red light blinking. There should be a label telling you the codes. Red blinking will likely be one of them, what does it say