The thermostat is calling for heat, 65 deg, the temperature is only 58 and furnace is in lock down showing error code 14. The furnace is a Bryant 383KAV. If I cycle the power to the furnace off and then on again, the furnace will start and run in a normal fashion.

This has been happening more and more frequently. It seems to happen more in the mornings. I have been researching this problem online. Could this be that I just need to replace the flame sensor? Or Should I replace the main circuit board in the furnace?

Please advise.