If the impeller is damaged, you will feel a vibration. However, I would now check the power valves. Pull the caps off and make sure they are physically working. Sometimes the pin can break in the top meaning the electric motor will still work but it wont turn the valves. Also, if you use synthetic oil instead of mineral oil, it can clog the valves breaking the plastic connectors between them and/or breaking the top pins. If this is the case, you will have to pull them all out and clean them.
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