Without hearing the noise I would guess the bearings in the wash pump are going bad. This an issue that happens from time to time especially if the dishwasher sits idle for longer periods of time and something that does need attention as it could start leaking water and do floor damage.
Answers & Comments
Without hearing the noise I would guess the bearings in the wash pump are going bad. This an issue that happens from time to time especially if the dishwasher sits idle for longer periods of time and something that does need attention as it could start leaking water and do floor damage.