I have a Weather King furnace, and it is not working properly. When I turn it on, I hear the system starting. It takes approximately 15-20 seconds for the burners to ignite. They stay on for about 5-6 seconds and then shut off. The system will repeat this again 2 more times, and the same thing happens. Is there anything that I can do to troubleshoot this? I can post pictures if that would help. I don’t have much HVAC experience, but I have done a lot of electrical. I’m not sure if that helps at all.

I have a Bryant/Carrier 394GAD furnace. Original with the house built in 1991. It's been very reliable until recently. I plan to replace it in the spring once my daughter is out of college, just trying to get through one more winter without spending big $$. Last week during the heat wave, the AC didn't blow cold and the refrigerant line was frozen. I believe the blower motor fan in the furnace was still blowing at that time, but I could be wrong. I didn't do anything about it since it was probably going to be the last hot day of the year. I went to fire up the furnace for the first time yesterday, and the burners light, but the fan will not start. There is a distinct humming sound coming from inside the furnace. When I kill power to the furnace, the buzzing sound stops. My first inclination was a bad capacitor on the air handler/blower motor fan. I peeked inside the box and I saw no capacitor mounted in the usual location. I removed the squirrel cage (with plans to clean it thoroughly) thinking it was located inside, but no... I do not see a capacitor. 1) Is is possible the motor has a capacitor built in? I plan to unmount the blower motor to get the motor model number. I would think that would give me some direction. 2) Would the blower motor not starting have been a cause of the AC not starting up? My experience is that when the air doesn't blow across the evaporator coil, that would cause the frozen lines (along with a lost of other problems, like low refrigerant, etc). I noticed that when I spin the fan in the squirrel cage, it turns for maybe 1/2 to 3/4 turn. I thought it should spin more freely... so I'm thinking it's a bad blower motor. Any advice is greatly appreciated.