After considerable money and a lot of work, we were just ready to start showing my deceased mother's home, and now this: The Bryant 310AAV/JAV furnace will start, run for a couple of minutes and then shut down. It will do that again when power is disconnected and reconnected. The trouble codes are first 14 then 34 when the system locks. I cleaned the flame sensor with steel wool, reinstalled and no luck, the same deal. The lack of heat caused a lot of moisture in the house and condensate on the windows. Not a good situation for selling a house! Any advice and help will be greatly appreciated. Thanks