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The light wash button light flashing is an error code and it means that the dishwasher thinks that the light wash button is stuck. Try to flip the circuit breaker off to the dishwasher on your house or unplug the dishwasher. Heat up the touchpad with a hair dryer and then rub your thumb over the light button. Wait 5 minutes or so for the touchpad to cool down and then re-apply power. If the same error code re-appears, you'll need to order and replace the touch control panel because the touchpad is just shorted I'm sorry to say.
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