Came home from work Thursday night to a cold house. After trouble shooting and watching YouTube videos I figured out that it might be the ignitor. I took the part out and sure enough the ceramic coil was cracked. I found a compatible part at Grainger, listed the model of coil on the back of the package to the broken one in hand and installed last night. Once back in place I hear the unit begin the warm up cycle, hear the ignitor light and gas start but within a few seconds I hear it cut out. The longest I've gotten it to run is a minute, something keeps tripping it out. I am getting 3 flashes which is telling me that there might be a "false flame" but really unsure of where to go from here. Any help would be appreciated. Now that it's the weekend before Christmas I doubt I am going to find any "good" part stores open and really can't afford to have a plumber here to check it out. Not sure if the igniter is the wrong one, where I would find the right one, or if it's the gas valve or something else. I appreciate any advice, can take pics and post any more info if needed.