Over water tub sensor won't reset

I have a Samsung dishwasher, DW80J. The heavy light began flashing which on this model indicates too much water in the tub. The pump ran constantly and I dried out the sump as much as I could. It is now bone dry but the heavy light continues to flash. If I turn it off at the breaker and leave it for a while, the pump will run again when I turn it back on, then eventually stop but the heavy light won't stop flashing. If I turn the power off at the control panel it starts up again with a warning chime and starts flashing heavy again. Any suggestions?