How do I know if my dryer control board is bad?

You know your dryer control board is bad when you experience multiple electronic symptoms that persist after hard reset and basic checks. Common signs of bad dryer control board include dryer not starting at all or display completely blank even though outlet has 240 volts for electric or 120 volts for gas and breaker not tripped, indicating board not sending power to motor and heater. Second, error codes that return immediately after reset, such as E01 for control failure or flashing lights that cannot be cleared. Third, dryer runs but no heat even though heating element tests good with multimeter, board relay may have failed to send power to element. Fourth, dryer stops mid-cycle randomly due to board glitch. Fifth, buttons not responding or display showing incorrect time. Sixth, burning smell or visible burn marks on board, open back panel near top and inspect main control board for blackened components, melted plastic, or swollen capacitors. To test, unplug dryer for 10 minutes to reset, if symptoms persist, test power to board with multimeter, board should have 120 volts input and send power to motor relay. Control board replacement costs 150 to 400 dollars including board at 100 to 250 dollars plus labor. Always check cheaper parts first like thermal fuse at 10 to 25 dollars and door switch at 15 to 30 dollars that mimic board failure, as board failure is less common than fuse blow.