I have a AO Smith power vent acting up. At first unit was locking out at initial startup, reading forum here, i cleaned flame sensor and this seemed to be a temperary fix for a month at a time. it ending up getting so bad i bought a new sensor and flame rod assembly and installed only to have same problem..unit would lock out before igniting... green light on and 2 yellow A B lights on. i cleaned out whole unit under and blew compressed air throughout venting system and burner...this seemed work for month or so and now i am getting new problem. at intial start-up the igniter will fire and flame will start heat water, however after about 5 minutes the flame kicks off and it goes through the cylce to restart again and after 3 times it locks out with code above. after hour i am guessing, it must reset itself and i hear heater restart again and it starts fine but then after 5 minutes being on, the flame shuts off and it tries the same cylcle again trying to light and only lock out..this goes on eveyhour. i finally get some hot water after 4-5 hours of doing this cycle. any ideas what this might be?
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