How to know if washing machine control board is bad involves observing symptoms indicating electronic failure, with signs including washer not starting despite power on, display not lighting up or flickering, buttons not responding, washer stopping mid cycle, error codes that do not clear after reset, washer not filling, spinning, or draining even though mechanical parts like pump and motor tested good, burning smell from board, visible burn marks or swollen capacitors on board, and washer randomly changing cycles. Control board is brain of washer that controls all functions, so if multiple functions fail simultaneously, board likely bad. To diagnose, first power cycle by unplugging 5 minutes, if problem persists, check for error codes, test door lock, drain pump, and motor separately, if those work but board not sending voltage, board bad. Use multimeter to check power to board. If display shows no power but outlet has power, board failure. If washer stuck in loop or does not respond to button presses, board bad. Technician can test board output. So signs are no power, unresponsive controls, erratic behavior, persistent errors, and visible damage.
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