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My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. This was easy to get to and replace and my last hope before waiting for someone to come fix it. The capacitor cost $4.04 with tax and had my AC working again. Needless to say I was beyond happy. I hope this can help others with a similar problem.
4 flashes is an overheat situation most likely caused by the blower not blowing. The blower relay controls the blower function. It is part of the circuit board. I suspect a new board will take care of the problem if you don't find a lose wire or something simple.
Called Beckett at 1-800-OIL-BURN and explained the problem. They told me that the solenoid on the oil pump (Clean Cut) was the cause. I purchased a new pump for $50 at the local plumbing supply and installed it. Problem solved.
It sounds like the blower motor has burnt up.(the one inside) The unit running for a few minutes then shutting off, is due to the high pressure/temperature safeties. When you removed the panels, did you notice any fan running?