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E24 means that the dishwasher isn't draining properly so the error appears to be correct if it really isn't draining. You said you removed the pump cover so if you found no debris and reinstalled the cover and it still won't drain, either your drain pump is bad or you have a blockage somewhere. Now if you replace the garbage disposal before this issue occurred possibly the knock out plug in the disposal wasn't removed. Other than that you'd need to disconnect the drain hose from under the dishwasher and blow through it to make sure it's clear. If it's clean then you'll need to replace the drain pump.
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