That would be the only thing left, poor recirculation pressure. The filter is shown as number 6 in the breakdown. If it is plugged, it will most likely need to be replaced because cleaning is not usually very successful with the fine mesh. That filter is available below.
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The link below is to the part you will need from a highly recommended company rated A+ with the Better Business Bureau. They offer a 100% money back guarantee, EVEN ON INSTALLED ELECTRICAL PARTS, for an entire year! They are the only company to allow returns on installed parts for a refund and offer a FULL ONE YEAR WARRANTY!
Filter Assembly <----- CLICK HERE FOR THE CORRECT PART FOR YOUR MODEL
If the filter is found to be clean, the wash impeller, number 5, will need to be replaced, available below.
Impeller <----- CLICK HERE FOR THE CORRECT PART FOR YOUR MODEL
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