You should be able to reset the flashing clean light. Press High Temp Wash, Heated Dry, High Temp Wash, Heated Dry, High Temp Wash, Heated Dry, High Temp Wash, Heated Dry. All the lights should go solid at which point you can press cancel to reset the board. If that doesn't work, then your control board that you replaced just came faulty because nothing else would stop the flashing clean light from at least resetting.
Now if you reset the issue and the clean light comes back in the next cycle, you have a problem. You could have a failed component including a faulty heater, control board, or high limit thermostat. You'd need to uninstall your dishwasher, disconnect power and lay it on it's back to check the resistance of the heater as well as the resistance of the high limit thermostat to confirm if they were bad or good. You should get tangible reading of between 5 and 30 ohms on the heater if it's good and less than one ohm on the high limit thermostat. If both of those devices check good, then replace the control board because that's the one device you cannot test.
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