I called customer service and asked if it was more likely to be the motor or the control board. The CS person wouldn't diagnose, but she was willing to say that they sell many more motors than controller boards, so I ordered the motor. Then, right after I clicked purchase, I remembered I meant to buy a washer, so I quickly called CS. This time the CS person said she couldn't modify an existing order, but she was willing to ship out a washer without additional shipping charges. The motor an washer arrived sooner than expected, and my ice dispenser is working again.