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It's quite possible that you could have had a power surge that damaged the control board. It's also possible that the filter on the cold water inlet is clogged and needs to be cleaned. If you've never had this serviced this would be a good time. At the very least the unit should be flushed out every couple years so it's long over due for that
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Are you getting a flashing error code (number)? if so what is it?