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The flashing clean light tells you everything that is wrong with your dishwasher. 4 flashes means that your washer is detecting your circulation pump drawing too much power. You'll want to flip the circuit breaker off to the dishwasher and pull the dishwasher out so you can tip it on it's back or side. First, look at the hose connected to the pump. The clamp on the hose has been known to come loose and cause the pump to get wet. If that occurred, get a new clamp and leave the dishwasher unplugged or the breaker turned off to it for 48 hours while it dries out and you should be good to go again.
Now if the hose is still securely attached, then you'll need to remove the circulation pump and check for any debris hitting the impeller stopping it or causing resistance. Remove any debris you find, then reassemble the dishwasher and try to run a cycle. If you get the error code coming back, the circulation pump would need to be replaced I'm sorry to say. The circulation pump is the large motor below the dishwasher just to be clear since there is a drain pump and diverter.
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