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An F10 is loss of flame signal which is usually caused by a dirty/oxidized flame sensor and/or a dirty combustion chamber. You might be able to clean the flame sensor but cleaning the combustion chamber is a job for a pro. Cleaning the flame sesnor will require some mechanial experience but it's not extremely difficult. Before you dive into this cycle the power off then back on with the thermostat calling for heat. Look into the viewing port for th ecombustion chamber. Does the burner fire up? Is the flame stable?